From 83d2e244485d9de6af462434c2737762505ba090 Mon Sep 17 00:00:00 2001
From: Horldsence <m18511047688@163.com>
Date: Thu, 10 Sep 2026 22:38:27 +0800
Subject: [PATCH] refactor(arch): redesign the code structure

---
 .gitignore                                    |   3 +
 README.md                                     | 103 ++++-
 docs/协议规则表与状态机.md                    | 123 ++++++
 docs/问题一解答.md                            |  24 +-
 main.py                                       |   6 +-
 pyproject.toml                                |  28 +-
 .../assets}/q1.template.html                  |   0
 .../assets}/standalone.css                    |   0
 {src/scripts => scripts}/benchmark_q1.py      |   7 +-
 {src/scripts => scripts}/build_q1_demo.py     |  14 +-
 {src/scripts => scripts}/capture_practice.py  |   4 +-
 {src/scripts => scripts}/render_q1_figures.py |   0
 .../verify_visualization.cjs                  |   2 +-
 src/mcm26b/__init__.py                        |  21 +
 src/mcm26b/belief/__init__.py                 |  58 +++
 src/mcm26b/cli.py                             |  78 ++++
 src/mcm26b/config.py                          |  88 +++++
 src/mcm26b/coverage/__init__.py               |  56 +++
 src/mcm26b/evaluation/__init__.py             |  81 ++++
 {geometry => src/mcm26b/geometry}/__init__.py |   5 +-
 {geometry => src/mcm26b/geometry}/__main__.py |   6 +-
 .../mcm26b/geometry}/localization.py          |   0
 {geometry => src/mcm26b/geometry}/planning.py |   0
 src/mcm26b/planner/__init__.py                |  80 ++++
 src/mcm26b/protocol/__init__.py               |  15 +
 src/mcm26b/protocol/client.py                 | 288 ++++++++++++++
 src/mcm26b/protocol/log.py                    |  34 ++
 src/mcm26b/protocol/rules.py                  |  94 +++++
 src/mcm26b/protocol/state.py                  |  97 +++++
 src/mcm26b/protocol/timing.py                 |  55 +++
 src/mcm26b/protocol/transport.py              |  44 +++
 src/mcm26b/sim/__init__.py                    |   8 +
 src/mcm26b/sim/playback.py                    |  38 ++
 src/mcm26b/sim/simulator.py                   | 231 +++++++++++
 src/mcm26b/sim/transport.py                   |  53 +++
 src/visualization/question1.html              | 185 ---------
 {src/tests => tests}/test_geometry.py         |   4 +-
 .../test_geometry_certificates.py             |   7 +-
 {src/tests => tests}/test_practice_replay.py  |   2 +-
 tests/test_protocol_client.py                 | 253 ++++++++++++
 tests/test_protocol_timing.py                 | 207 ++++++++++
 uv.lock                                       | 363 +++++++++++++++++-
 42 files changed, 2514 insertions(+), 251 deletions(-)
 create mode 100644 docs/协议规则表与状态机.md
 rename {src/visualization => scripts/assets}/q1.template.html (100%)
 rename {src/visualization => scripts/assets}/standalone.css (100%)
 rename {src/scripts => scripts}/benchmark_q1.py (92%)
 rename {src/scripts => scripts}/build_q1_demo.py (90%)
 rename {src/scripts => scripts}/capture_practice.py (97%)
 rename {src/scripts => scripts}/render_q1_figures.py (100%)
 rename {src/scripts => scripts}/verify_visualization.cjs (97%)
 create mode 100644 src/mcm26b/__init__.py
 create mode 100644 src/mcm26b/belief/__init__.py
 create mode 100644 src/mcm26b/cli.py
 create mode 100644 src/mcm26b/config.py
 create mode 100644 src/mcm26b/coverage/__init__.py
 create mode 100644 src/mcm26b/evaluation/__init__.py
 rename {geometry => src/mcm26b/geometry}/__init__.py (54%)
 rename {geometry => src/mcm26b/geometry}/__main__.py (93%)
 rename {geometry => src/mcm26b/geometry}/localization.py (100%)
 rename {geometry => src/mcm26b/geometry}/planning.py (100%)
 create mode 100644 src/mcm26b/planner/__init__.py
 create mode 100644 src/mcm26b/protocol/__init__.py
 create mode 100644 src/mcm26b/protocol/client.py
 create mode 100644 src/mcm26b/protocol/log.py
 create mode 100644 src/mcm26b/protocol/rules.py
 create mode 100644 src/mcm26b/protocol/state.py
 create mode 100644 src/mcm26b/protocol/timing.py
 create mode 100644 src/mcm26b/protocol/transport.py
 create mode 100644 src/mcm26b/sim/__init__.py
 create mode 100644 src/mcm26b/sim/playback.py
 create mode 100644 src/mcm26b/sim/simulator.py
 create mode 100644 src/mcm26b/sim/transport.py
 delete mode 100644 src/visualization/question1.html
 rename {src/tests => tests}/test_geometry.py (97%)
 rename {src/tests => tests}/test_geometry_certificates.py (94%)
 rename {src/tests => tests}/test_practice_replay.py (97%)
 create mode 100644 tests/test_protocol_client.py
 create mode 100644 tests/test_protocol_timing.py

diff --git a/.gitignore b/.gitignore
index 200986c..cbaedff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,6 @@ docs/paper/*.fls
 docs/paper/*.fdb_latexmk
 docs/paper/*.xdv
 docs/paper/*.synctex.gz
+
+# pytest
+.pytest_cache/
diff --git a/README.md b/README.md
index 9ab2a54..cef810b 100644
--- a/README.md
+++ b/README.md
@@ -1,29 +1,92 @@
-# B题问题一 交会定位
+# mcm26b — CUMCM 2026 B题：无线电干扰源的快速自动定位与清除
 
-给定同一干扰源的检测点坐标及带 $\pm 1^\circ$ 误差的示向度，计算前向角域交集、定位区域直径、直径圆覆盖判断与最小包围圆。
+统一框架：有界误差几何定位、主动选点、带覆盖证明的搜索、按真实动作耗时调度。
+分析依据 `issue/B题.pdf`、附件1《模拟器使用说明》、附件2《通信接口说明及编程指南》。
 
-- [完整中文解答与算法证明](docs/问题一解答.md)
-- [修订后的四问思路与P0–P7计划](B题建模分析与实施计划.md)
-- [核心代码](geometry/localization.py)
-- [离线交互模拟](output/q1/question1.html)
-- [官方演练观测与原始记录](output/q1/practice/)
-- [优化与舍入敏感性报告](output/q1/optimization_report.json)
+- [四问建模分析与 P0–P7 实施计划](docs/B题建模分析与实施计划.md)
+- [协议规则表、字段表与状态机（P0 交付）](docs/协议规则表与状态机.md)
+- [问题一完整解答](docs/问题一解答.md)
+- [论文](docs/paper/main.tex)
 
-Python3.10及以上，核心算法和演示生成无需安装第三方库。
+## 项目结构
 
-```powershell
-python -m geometry examples/q1/triangle.json
-python main.py examples/q1/normal.json -o output/q1/result.json
-python -m geometry examples/q1/normal.json --rounding-margin-deg 0.005
-python -m unittest discover -s tests -v
-python scripts/build_q1_demo.py
-python scripts/benchmark_q1.py
+```
+src/mcm26b/
+├── config.py      # 参数中心：题面常量[题面] + 工程参数[工程]，唯一字面量来源
+├── protocol/      # P0/P1 字段表、计时模型、状态机、串行幂等客户端（已完工）
+├── geometry/      # P2 角域交会、直径、MEC、问题二安全候选盘证书（已完工）
+├── sim/           # 自建模拟器、故障注入、演练日志回放（测试专用，已完工）
+├── belief/        # P3 逐频道候选集合 K_c（骨架）
+├── coverage/      # P4 49点覆盖账本（骨架 + 网格生成）
+├── planner/       # P3 选点 / P4 全向闭环 / P5 定向扩展（骨架）
+└── evaluation/    # 日志复算与统计（复算已完工）
+tests/             # pytest（兼容 unittest 风格），53 项
+scripts/           # 采集、基准、可视化与校核脚本
+output/ examples/  # 演练证据、算例与生成产物
 ```
 
-用浏览器打开 `output/q1/question1.html`。可选择合成反例或官方演练，逐个加入测点，切换全景与定位区域放大。
+## 快速开始
 
-输出新增直径圆覆盖反例顶点、最大超出距离和 20 米清除余量；默认仍为题设 $\pm 1^\circ$，舍入裕量须显式启用。最小包围圆使用可复现的随机增量算法，原枚举法保留作独立对照。`geometry.first_bearing_candidate_disk` 提供问题二首次测向安全区域的解析证书；问题二选点优化器及问题三、四的全清闭环仍待实现。
+Python ≥ 3.10，依赖仅 `requests`（测试另需 `pytest`）。
 
-可视化事件检查使用Node.js：`node scripts/verify_visualization.cjs`。可选PNG重绘使用Pillow及Windows微软雅黑字体：`python scripts/render_q1_figures.py`；这些只用于图形校核，不是核心求解依赖。
+```bash
+uv sync                                   # 安装（可编辑挂载本包）
+uv run pytest                             # 全部测试
+uv run mcm26b sim-check                   # P0 自检：复现附件计时示例 105/111/194/199
+uv run mcm26b q1 examples/q1/normal.json  # 问题一求解（等价 python -m mcm26b.geometry ...）
+uv run python main.py examples/q1/triangle.json --rounding-margin-deg 0.005
+```
 
-本项目只使用官方**演练**采集了问题一所需观测，未使用正式测试。采集器不会启动测试，必须先在界面确认“问题3演练”、接口已就绪，再提供 `--practice-confirmed` 和本局案例编码。参见完整解答中的采集说明。
+## 问题一（P2，已完工）
+
+给定同频道多个检测点及 ±1° 误差示向度，计算前向角域交集（半平面交）、
+定位区域直径、直径圆覆盖判断（含反例顶点与超出距离）与最小包围圆、20m 清除余量。
+
+```bash
+uv run mcm26b q1 examples/q1/normal.json -o output/q1/result.json
+uv run python scripts/build_q1_demo.py      # 重建离线交互可视化 output/q1/question1.html
+uv run python scripts/benchmark_q1.py       # MEC 基准与舍入敏感性
+```
+
+离线交互页：`output/q1/question1.html`。可选 PNG 重绘需要 Pillow 与 Windows
+雅黑字体：`python scripts/render_q1_figures.py`；事件校核需要 Node.js：
+`node scripts/verify_visualization.cjs`。二者仅为图形校核，非求解依赖。
+
+## 协议基线（P0/P1，已完工）
+
+- `protocol.rules`：四条指令的字段表、结果码与错误语义（可执行表格）；
+- `protocol.timing`：纯计时模型，逐步复现附件示例 105/111/194/199；
+- `protocol.state.RobotState`：位置/频道/虚拟时刻状态机；accepted=false 不更新，
+  `/clear` 不切频道，虚拟时刻以 accepted 响应为准；
+- `protocol.client.SimulatorClient`：串行发送、幂等重试（同 ID 同内容原样重发）、
+  连接/读超时、基于 `remaining_real_duration_s` 的本地截止时钟与退出预留、JSONL 会话日志；
+- `sim.LocalSimulator`：按附件语义复现模拟器（观测门限、定向覆盖角、幂等回放、
+  400/accepted=false 语义），真值只对测试端开放；`ScriptedFaultTransport` 注入断连/超时/500，
+  `PlaybackTransport` 回放官方演练日志。
+
+```python
+from mcm26b.protocol import SimulatorClient
+client = SimulatorClient("参赛队号")       # 默认 http://127.0.0.1:2026
+client.enter()
+outcome = client.measure((300, 400), 1)    # MeasureOutcome(result, svd_deg, ...)
+client.exit()
+```
+
+## 阶段状态（对照 P0–P6 计划）
+
+| 阶段 | 状态 |
+| --- | --- |
+| P0 规则固定（规则表/状态机/字段表，示例逐步 105/111/194/199） | ✅ 完成 |
+| P1 协议基线（客户端 + 自建回放/故障注入测试） | ✅ 完成 |
+| P2 几何内核（角域交、直径、MEC、证书） | ✅ 完成（迁入 `mcm26b.geometry`） |
+| P3 问题二选点（K1、候选区域 Q、采样评估） | 🦴 骨架（证书已完工） |
+| P4 问题3全向闭环（49点覆盖、定位队列、清除、停止） | 🦴 骨架 |
+| P5 问题4定向扩展（联合约束、后备清除、预算） | 🦴 骨架 |
+| P6 加速与消融 | 🦴 未开始 |
+
+## 采集与正式测试约束
+
+本项目只使用官方**演练**采集观测，从未使用正式测试。`scripts/capture_practice.py`
+不会启动测试：必须先在界面确认“问题3演练”、接口已就绪，再提供
+`--practice-confirmed` 与本局案例编码。正式测试由团队按计划另行安排；
+加密日志上传上限 2MB，程序避免异常高频循环。
diff --git a/docs/协议规则表与状态机.md b/docs/协议规则表与状态机.md
new file mode 100644
index 0000000..68cbbb2
--- /dev/null
+++ b/docs/协议规则表与状态机.md
@@ -0,0 +1,123 @@
+# 协议规则表、字段表与状态机（P0 交付）
+
+依据：`issue/附件/附件1.docx`《模拟器使用说明》、`issue/附件/附件2.docx`《模拟器通信接口说明及编程指南》。
+本文是人类可读版本；**可执行版本**是 `src/mcm26b/protocol/rules.py`（字段表与错误语义）、
+`src/mcm26b/protocol/timing.py`（计时模型）与 `src/mcm26b/config.py`（全部常量），
+三者由 `tests/test_protocol_timing.py`、`tests/test_protocol_client.py` 固化验收。
+
+## 1. 动作与耗时规则表
+
+| 动作 | 指令 | 虚拟耗时 | 说明 |
+| --- | --- | --- | --- |
+| 开始 | `POST /enter` | 0 | 初始位置 (0,0)，初始频道 1；虚拟/程序时钟开始 |
+| 检测 | `POST /measure` | 5 + 移动 + 换频道 | 无论结果（no_signal/near/direction）均为 5s |
+| 清除 | `POST /clear` | 未发现 3 / 成功 5 + 移动 | 5 = 光学定位 3 + 激光清除 2；**不切换测向频道** |
+| 结束 | `POST /exit` | 0 | 成功响应中 exit_reason 固定 `user_exit` |
+| 切换频道 | 无独立指令 | 1 | 只由合法 `/measure` 的 channel 变化推断 |
+| 移动 | 无独立指令 | 直线距离/5(m/s) | 由 `/measure` 或 `/clear` 的 position 推断 |
+
+派生事实（易错点）：
+- 一次合法 `/measure` 完成后，测向机频道更新为本次检测频道；
+- `/clear` 的 channel 只是目标频道，既不切频道、也不产生切换耗时，因此
+  "清除后原地再测"的耗时只取决于上一次 **/measure** 的频道；
+- 只有 accepted=true 的请求推进虚拟时钟；`accepted=false` 的 virtual_time_s=0 不是当前时刻；
+- 5 秒检测只是虚拟耗时，不要求现实等待。
+
+## 2. 字段表
+
+公共请求字段（4 条指令都必填）：
+
+| 字段 | 类型 | 约束 |
+| --- | --- | --- |
+| arena_id | string | 必须为 `"default"` |
+| robot_id | string | 逐字节等于登录参赛队号；UTF-8 长度 1..64；无控制字符 |
+| request_id | string | 会话内幂等键；UTF-8 长度 1..128；无控制字符 |
+
+动作字段（实现见 `rules.ACTION_FIELDS`）：
+
+| 指令 | 字段 | 约束 |
+| --- | --- | --- |
+| /enter | （无附加） | |
+| /measure | position{x,y}, channel | x/y 有限数值且 \|v\|<=2,000,000；channel 整数 1..20（1.0 亦接受，1.5 拒绝） |
+| /clear | position{x,y}, channel | 同上；channel 是目标频道 |
+| /exit | （无附加） | |
+
+响应字段：
+
+| 场景 | 字段 |
+| --- | --- |
+| 所有响应 | accepted, real_timestamp_ms, virtual_time_s |
+| accepted=false | 仅上述 3 个字段（virtual_time_s=0） |
+| /enter 成功 | + max_virtual_duration_s, max_real_duration_s, remaining_real_duration_s |
+| /measure 成功 | + measure_result ∈ {no_signal, near, direction}；direction 时另有 svd_deg（保留两位小数） |
+| /clear 成功 | + clear_result ∈ {success, no_target_in_range} |
+| /exit 成功 | + exit_reason = "user_exit" |
+
+错误语义（必须同时检查 HTTP 状态与 accepted）：
+
+| 情形 | 结果 | 对 request_id 的影响 |
+| --- | --- | --- |
+| JSON 语法/重复键/缺字段/类型/坐标频道范围 | HTTP 400 | 不占用，修正后可复用 |
+| 未知字段（含 position 下）、arena/robot 不匹配、测试状态拒绝 | HTTP 200, accepted=false | 不占用 |
+| 动作被接受 | HTTP 200, accepted=true | 占用 |
+| 同 ID 不同内容，或并发不同动作 | HTTP 409 | — |
+| 网络失败重试同一动作 | 复用原 ID+原内容，服务器回放首次响应 | 不重复生效 |
+| 429/500 | 可原样重试 | — |
+| 404/405/413/415 | 确定性错误，不得重试 | — |
+
+物理规则速查：Ω 半径 1800m；源数 10–16；频道 1–20；接收半径 [1000,1500]m（逐源未知）；
+near 阈值 5m；清除半径 20m（与定向朝向无关）；定向覆盖 = 朝向两侧各 90°（含边界）；
+示向度误差幅度 ±1°，保留两位小数；虚拟限时 360000s；程序限时 1200s（以 /enter 的
+remaining_real_duration_s 为准，不得假定恒为 1200）；测试窗口 25 分钟。
+
+## 3. 状态机
+
+机器狗会话状态（`protocol.state.RobotState` + 客户端会话标志）：
+
+```
+            /enter accepted           /exit accepted
+  [未进入] ───────────────▶ [已进入] ───────────────▶ [已退出]
+     │ accepted=false            │ accepted=false           │ 任何动作 accepted=false
+     └── 不变                    └── 不变                   └── 不变
+```
+
+[已进入] 状态内跟踪：position、测向机 channel、virtual_time_s。转移规则：
+
+| 事件 | position | channel | virtual_time_s |
+| --- | --- | --- | --- |
+| /enter accepted | (0,0) | 1 | 0 |
+| /measure accepted | ← 本次 position | ← 本次 channel | ← 响应值（=旧值+移动+切换+5） |
+| /clear accepted | ← 本次 position | **不变** | ← 响应值（=旧值+移动+3或5） |
+| /exit accepted | 不变 | 不变 | ← 响应值 |
+| accepted=false / 网络 / 400 | 不变 | 不变 | 不变 |
+
+虚拟时刻以最近一次 accepted=true 的响应为准；本地预测（timing 模块）只用于
+规划与一致性核对，偏差记入 `RobotState.mismatches` 并写日志（strict 模式抛错）。
+
+## 4. 计时示例逐步推演（附件1表2 = 附件2第10节）
+
+| 步 | 指令 | 移动 | 换频道 | 动作 | 本步 | 累计 |
+| --- | --- | --- | --- | --- | --- | --- |
+| 1 | /enter | 0 | 0 | 0 | 0 | **0** |
+| 2 | /measure (300,400) ch1 | 500m→100s | 0（初始即1） | 5 | 105 | **105** |
+| 3 | /measure (300,400) ch2 | 0 | 1 | 5 | 6 | **111** |
+| 4 | /clear (300,0) 目标ch3 | 400m→80s | 0（clear不切频道） | 3（未发现） | 83 | **194** |
+| 5 | /measure (300,0) ch2 | 0 | 0（第3步后已是2，clear未改） | 5 | 5 | **199** |
+| 6 | /exit | 0 | 0 | 0 | 0 | **199** |
+
+验收：`uv run mcm26b sim-check` 通过完整客户端→本地模拟器链路复现
+`[105, 111, 194, 199]`；`tests/test_protocol_timing.py::TimingModelTests`
+逐步断言每个分项。
+
+## 5. 客户端设计要点（P1 交付）
+
+- **串行**：完全同步，一个动作未决不发下一个；
+- **幂等重试**：请求体一次性序列化为 bytes，网络失败/429/500 时原样重发
+  （同 request_id 同内容），最多 `max_attempts` 次，指数退避；400/404/405/409/413/415 立即失败；
+- **accepted=false**：抛 `ActionRejected`，状态不更新；virtual_time_s=0 不入时钟；
+- **现实预算**：/enter 成功后 `deadline = monotonic() + remaining_real_duration_s`；
+  新动作前检查 `剩余 > reserve_exit_s`（默认 60s [工程]），/exit 豁免；
+- **日志**：`SessionLog` 逐事件追加 JSONL（attempt/transport_error/accepted），
+  进程崩溃不丢已发记录，回放测试与 evaluation 复算共用同一格式；
+- **本地预校验**：channel 范围、坐标有限性与 2e6 上限、robot_id/request_id 格式
+  在发送前拒绝（与服务器 400 语义一致，省一次往返）。
diff --git a/docs/问题一解答.md b/docs/问题一解答.md
index c875ead..69498ce 100644
--- a/docs/问题一解答.md
+++ b/docs/问题一解答.md
@@ -182,15 +182,15 @@ $$
 
 ## 八、运行方式和代码入口
 
-核心算法仅用Python标准库，支持Python3.10及以上；本次在Python3.12.14中验证。在项目根目录运行：
+核心算法仅用Python标准库，支持Python3.10及以上；工程依赖仅 `requests`（测试另需 `pytest`）。在项目根目录运行：
 
 ```powershell
-python -m geometry examples/q1/triangle.json -o output/q1/triangle_recomputed.json
-python main.py examples/q1/normal.json
-python -m geometry examples/q1/normal.json --rounding-margin-deg 0.005
-python -m unittest discover -s tests -v
-python scripts/build_q1_demo.py
-python scripts/benchmark_q1.py
+uv run python -m mcm26b.geometry examples/q1/triangle.json -o output/q1/triangle_recomputed.json
+uv run mcm26b q1 examples/q1/normal.json
+uv run python -m mcm26b.geometry examples/q1/normal.json --rounding-margin-deg 0.005
+uv run pytest
+uv run python scripts/build_q1_demo.py
+uv run python scripts/benchmark_q1.py
 ```
 
 输入JSON的最小格式：
@@ -209,22 +209,22 @@ python scripts/benchmark_q1.py
 
 | 文件 | 职责 |
 | --- | --- |
-| `geometry/localization.py` | 测向角域、半平面、区域分类、直径和包围圆 |
-| `geometry/planning.py` | 问题二首次测向的距离保证候选圆盘；独立于问题一模型 |
-| `geometry/__main__.py`、`main.py` | JSON命令行输入输出 |
+| `src/mcm26b/geometry/localization.py` | 测向角域、半平面、区域分类、直径和包围圆 |
+| `src/mcm26b/geometry/planning.py` | 问题二首次测向的距离保证候选圆盘；独立于问题一模型 |
+| `src/mcm26b/geometry/__main__.py`、`src/mcm26b/cli.py` | JSON命令行输入输出 |
 | `tests/test_geometry.py` | 解析反例、随机几何、独立裁剪对照与退化测试 |
 | `tests/test_practice_replay.py` | 离线复算演练计时与观测结果，不连接模拟器 |
 | `tests/test_geometry_certificates.py` | 增量圆与穷举法对照、覆盖证据、清除阈值、舍入选项及首次选点证书 |
 | `scripts/benchmark_q1.py` | 局部性能对比与官方演练误差界敏感性复算 |
 | `scripts/capture_practice.py` | 在已经启动且已核验的演练中采集少量测向 |
 | `scripts/build_q1_demo.py` | 用Python算法生成案例、结果和交互图数据 |
-| `visualization/q1.template.html` | 可视化源模板；不另写一套求解算法 |
+| `scripts/assets/q1.template.html` | 可视化源模板；不另写一套求解算法 |
 | `output/q1/question1.html` | 可直接打开的离线交互式模拟，所有数据已内嵌 |
 
 如需再次采集，先在模拟器明确启动“问题3演练测试”，等待接口就绪，读取案例编码，然后运行：
 
 ```powershell
-python scripts/capture_practice.py --robot-id 你的参赛队号 --practice-confirmed --case-code 界面中的演练案例编码
+uv run python scripts/capture_practice.py --robot-id 你的参赛队号 --practice-confirmed --case-code 界面中的演练案例编码
 ```
 
 接口协议没有返回演练／正式模式的字段，`--practice-confirmed` 是操作者确认已核验界面的显式参数，不能替代界面核查。采集脚本没有启动测试的功能，没有正式模式选项，只会调用 `/enter`、`/measure`、`/exit`。禁止在正式测试会话中运行。
diff --git a/main.py b/main.py
index 1e333a1..d330c56 100644
--- a/main.py
+++ b/main.py
@@ -1,5 +1,5 @@
-from geometry.__main__ import main
-
+"""兼容入口，转发到统一 CLI（mcm26b）。"""
+from mcm26b.cli import main
 
 if __name__ == "__main__":
-    main()
+    raise SystemExit(main())
diff --git a/pyproject.toml b/pyproject.toml
index 8cb01ac..12d3ce7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,27 @@
 [project]
-name = "math"
-version = "0.1.0"
-description = "B题问题一：带误差方位交会定位与可视化"
+name = "mcm26b"
+version = "0.2.0"
+description = "CUMCM 2026 B题：无线电干扰源的快速自动定位与清除（协议基线、几何内核与策略骨架）"
 readme = "README.md"
 requires-python = ">=3.10"
-dependencies = []
+dependencies = [
+    "requests>=2.31",
+]
+
+[dependency-groups]
+dev = [
+    "pytest>=8",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/mcm26b"]
+
+[project.scripts]
+mcm26b = "mcm26b.cli:main"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
diff --git a/src/visualization/q1.template.html b/scripts/assets/q1.template.html
similarity index 100%
rename from src/visualization/q1.template.html
rename to scripts/assets/q1.template.html
diff --git a/src/visualization/standalone.css b/scripts/assets/standalone.css
similarity index 100%
rename from src/visualization/standalone.css
rename to scripts/assets/standalone.css
diff --git a/src/scripts/benchmark_q1.py b/scripts/benchmark_q1.py
similarity index 92%
rename from src/scripts/benchmark_q1.py
rename to scripts/benchmark_q1.py
index a65f56a..12d969f 100644
--- a/src/scripts/benchmark_q1.py
+++ b/scripts/benchmark_q1.py
@@ -8,10 +8,11 @@ from statistics import median
 import sys
 from time import perf_counter
 
+from mcm26b.geometry import (Measurement, solve, smallest_enclosing_circle,
+                             first_bearing_candidate_disk)
+from mcm26b.geometry.localization import _enclosing_circle_reference
+
 ROOT = Path(__file__).resolve().parents[1]
-sys.path.insert(0, str(ROOT))
-from geometry import Measurement, solve, smallest_enclosing_circle, first_bearing_candidate_disk
-from geometry.localization import _enclosing_circle_reference
 
 
 def timed(function, points, repeats):
diff --git a/src/scripts/build_q1_demo.py b/scripts/build_q1_demo.py
similarity index 90%
rename from src/scripts/build_q1_demo.py
rename to scripts/build_q1_demo.py
index dcb6a8d..ed0b416 100644
--- a/src/scripts/build_q1_demo.py
+++ b/scripts/build_q1_demo.py
@@ -4,11 +4,11 @@ from dataclasses import asdict
 import json
 import math
 from pathlib import Path
-import sys
 
-ROOT=Path(__file__).resolve().parents[1]
-sys.path.insert(0,str(ROOT))
-from geometry import Measurement, solve
+from mcm26b import Measurement, solve
+
+ROOT = Path(__file__).resolve().parents[1]
+ASSETS = Path(__file__).resolve().parent / "assets"
 
 
 def measured(stations, target, errors):
@@ -56,11 +56,11 @@ def main():
             (examples/(case['id']+'.json')).write_text(json.dumps({k:v for k,v in data.items() if k!='frames'},ensure_ascii=False,indent=2),encoding='utf-8')
         (results/(case['id']+'_result.json')).write_text(json.dumps(frames[-1],ensure_ascii=False,indent=2,allow_nan=False),encoding='utf-8')
     (results/'demo_data.json').write_text(json.dumps(dataset,ensure_ascii=False,indent=2,allow_nan=False),encoding='utf-8')
-    template=(ROOT/'visualization/q1.template.html').read_text(encoding='utf-8')
+    template=(ASSETS / 'q1.template.html').read_text(encoding='utf-8')
     fragment=template.replace('/*__Q1_DATA__*/',json.dumps(dataset,ensure_ascii=False,allow_nan=False))
-    (ROOT/'visualization/question1.html').write_text(fragment,encoding='utf-8')
+    (ROOT/'output'/'q1'/'question1_full.html').write_text(fragment,encoding='utf-8')
     # A standalone companion uses the same fragment and computation results.
-    theme=(ROOT/'visualization/standalone.css').read_text(encoding='utf-8')
+    theme=(ASSETS / 'standalone.css').read_text(encoding='utf-8')
     page='<!doctype html><html lang="zh-CN"><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>B题问题一交会定位</title><style>'+theme+'</style><body>'+fragment+'</body></html>'
     (results/'question1.html').write_text(page,encoding='utf-8')
     print(json.dumps({'cases':len(dataset),'fragment_bytes':len(fragment.encode('utf-8')),
diff --git a/src/scripts/capture_practice.py b/scripts/capture_practice.py
similarity index 97%
rename from src/scripts/capture_practice.py
rename to scripts/capture_practice.py
index a9fbc88..0bb6c0e 100644
--- a/src/scripts/capture_practice.py
+++ b/scripts/capture_practice.py
@@ -8,14 +8,12 @@ import argparse
 import json
 import math
 from pathlib import Path
-import sys
 import time
 import uuid
 from urllib.error import URLError
 from urllib.request import Request, urlopen
 
-sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
-from geometry import Measurement, solve
+from mcm26b import Measurement, solve
 
 
 class PracticeClient:
diff --git a/src/scripts/render_q1_figures.py b/scripts/render_q1_figures.py
similarity index 100%
rename from src/scripts/render_q1_figures.py
rename to scripts/render_q1_figures.py
diff --git a/src/scripts/verify_visualization.cjs b/scripts/verify_visualization.cjs
similarity index 97%
rename from src/scripts/verify_visualization.cjs
rename to scripts/verify_visualization.cjs
index 8689f40..f1eadc1 100644
--- a/src/scripts/verify_visualization.cjs
+++ b/scripts/verify_visualization.cjs
@@ -4,7 +4,7 @@
  */
 const fs=require('node:fs'),path=require('node:path'),vm=require('node:vm'),assert=require('node:assert');
 const rootDir=path.resolve(__dirname,'..');
-const source=fs.readFileSync(path.join(rootDir,'visualization/question1.html'),'utf8');
+const source=fs.readFileSync(path.join(rootDir,'output/q1/question1_full.html'),'utf8');
 const script=source.match(/<script>([\s\S]*?)<\/script>/)[1];
 class Element {
   constructor(tag) {this.tag=tag;this.attrs={};this.children=[];this.style={};this.events={};this.value='';this.max='3';this.textContent='';}
diff --git a/src/mcm26b/__init__.py b/src/mcm26b/__init__.py
new file mode 100644
index 0000000..29b08f6
--- /dev/null
+++ b/src/mcm26b/__init__.py
@@ -0,0 +1,21 @@
+"""mcm26b：CUMCM 2026 B题"无线电干扰源的快速自动定位与清除"求解包。
+
+模块分层（docs/B题建模分析与实施计划.md §7 的七模块划分）：
+- config     全项目参数中心（题面常量与工程参数，唯一字面量来源）
+- protocol   P0/P1 字段表、计时模型、状态机与串行幂等客户端
+- geometry   P2 角域交会定位、直径、最小包围圆与 P2 证书（已完工）
+- sim        自建模拟器、故障注入与演练日志回放（测试专用）
+- belief     P3 逐频道候选集合（骨架）
+- coverage   P4 49 点覆盖记录（骨架+网格生成）
+- planner    P3 选点 / P4 全向闭环 / P5 定向扩展（骨架）
+- evaluation 日志复算与统计
+"""
+
+__version__ = "0.2.0"
+
+from .config import DEFAULT_CONFIG, ProblemConfig
+from .geometry import Measurement, first_bearing_candidate_disk, solve, \
+    smallest_enclosing_circle
+
+__all__ = ["DEFAULT_CONFIG", "Measurement", "ProblemConfig", "solve",
+           "first_bearing_candidate_disk", "smallest_enclosing_circle"]
diff --git a/src/mcm26b/belief/__init__.py b/src/mcm26b/belief/__init__.py
new file mode 100644
index 0000000..552f655
--- /dev/null
+++ b/src/mcm26b/belief/__init__.py
@@ -0,0 +1,58 @@
+"""P3 逐频道信念状态：候选集合 K_c 维护与频道处理状态。
+
+现状：骨架（P3 起填充）。接口与不变式先行固定，防止后续实现漂移。
+
+核心不变式（验收标准）：
+- 保守性：真源永远属于维护中的候选集合；任何更新不得因误差、
+  圆弧离散或浮点容差把真点排除（自建真值案例中真源始终保留）；
+- direction 读数：K_c ⊆ Ω ∩ W(s, θ±δ) ∩ B(s, 1500)（首次测向构造见
+  geometry.planning.first_bearing_candidate_disk 的解析证书）；
+- no_signal 读数（P4，全向源）：仅可排除 B(s, 1000)；用于定向源时
+  是"位置×朝向"联合约束，单独维护空间候选会误删真源（P5 才启用）；
+- /clear 成功：状态转 CLEARED；失败只说明"该频道 20m 内无可清除源"，
+  不得直接删除超出 20m 的候选。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from enum import Enum
+
+from ..config import ProblemConfig
+
+
+class ChannelStatus(Enum):
+    UNKNOWN = "unknown"          # 尚无有效证据
+    DETECTED = "detected"        # 收到过 direction/near，待定位
+    LOCATED = "located"          # 候选集包围圆半径 <= 20，可清除
+    CLEARED = "cleared"          # 清除成功
+    ABSENT = "absent"            # 覆盖证明不存在（P4）
+
+
+@dataclass
+class ChannelBelief:
+    channel: int
+    status: ChannelStatus = ChannelStatus.UNKNOWN
+    measurements: list = field(default_factory=list)   # (位置, 结果, svd_deg) 记录
+
+
+class BeliefState:
+    """全部 20 个频道的信念集合。策略端唯一的事实来源。"""
+
+    def __init__(self, config: ProblemConfig = ProblemConfig()):
+        self.config = config
+        self.channels = {channel: ChannelBelief(channel)
+                         for channel in range(config.field.channel_min,
+                                              config.field.channel_max + 1)}
+
+    def update_measure(self, channel: int, position, result: str,
+                       svd_deg: float | None) -> None:
+        """按读数收敛候选集合。未实现：需要几何模块的在线圆盘角域交。"""
+        raise NotImplementedError("P3：接入 geometry 的圆盘约束角域交后实现")
+
+    def candidate_set(self, channel: int):
+        """返回该频道当前候选集合（保守外包形式）。未实现。"""
+        raise NotImplementedError("P3")
+
+    def mark_cleared(self, channel: int) -> None:
+        self.channels[channel].status = ChannelStatus.CLEARED
diff --git a/src/mcm26b/cli.py b/src/mcm26b/cli.py
new file mode 100644
index 0000000..a4b6a80
--- /dev/null
+++ b/src/mcm26b/cli.py
@@ -0,0 +1,78 @@
+"""统一命令行入口：mcm26b <子命令>。
+
+- q1        问题一角域交会求解（P2 已完工）
+- sim-check 用自建模拟器复现附件计时示例（P0 自检）
+- run       全向闭环（P4 骨架，未实现）
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import sys
+
+from .config import ProblemConfig
+from .geometry.__main__ import main as q1_main
+from .protocol.client import SimulatorClient
+from .protocol.rules import EXIT_USER
+from .sim import LocalSimTransport, LocalSimulator, Source
+
+
+def _sim_check(args) -> int:
+    """附件1表2/附件2第10节计时示例：期望 105/111/194/199 秒。"""
+    simulator = LocalSimulator([], robot_id=args.robot_id)
+    client = SimulatorClient(args.robot_id, transport=LocalSimTransport(simulator))
+    client.enter()
+    steps = []
+    steps.append(client.measure((300, 400), 1).virtual_time_s)   # 移动500m+检测5s
+    steps.append(client.measure((300, 400), 2).virtual_time_s)   # 换频道1s+检测5s
+    steps.append(client.clear((300, 0), 3).virtual_time_s)       # 移动400m+未发现3s
+    steps.append(client.measure((300, 0), 2).virtual_time_s)     # 原地检测频道2
+    info = client.exit()
+    expected = [105, 111, 194, 199]
+    ok = [round(value, 6) for value in steps] == expected \
+        and round(info.virtual_time_s, 6) == 199 and info.reason == EXIT_USER
+    print(json.dumps({"expected": expected, "got": steps,
+                      "final_virtual_time_s": info.virtual_time_s,
+                      "exit_reason": info.reason, "pass": ok},
+                     ensure_ascii=False))
+    return 0 if ok else 1
+
+
+def _run(args) -> int:
+    raise NotImplementedError(
+        "P4 全向闭环尚未实现；当前可用子命令：q1（问题一求解）、sim-check（协议自检）")
+
+
+def main(argv=None) -> int:
+    parser = argparse.ArgumentParser(prog="mcm26b", description=__doc__)
+    parser.add_argument("--config", default="",
+                        help="预留：覆盖 ProblemConfig 的 JSON 文件（参数化入口）")
+    subparsers = parser.add_subparsers(dest="command", required=True)
+
+    q1 = subparsers.add_parser("q1", help="问题一角域交会求解")
+    q1.add_argument("input", type=str)
+    q1.add_argument("-o", "--output", type=str, default=None)
+    q1.add_argument("--rounding-margin-deg", type=float, default=0)
+    q1.set_defaults(func=lambda a: q1_main([a.input] + (["-o", a.output] if a.output else [])
+                                           + (["--rounding-margin-deg", str(a.rounding_margin_deg)]
+                                              if a.rounding_margin_deg else [])) or 0)
+
+    check = subparsers.add_parser("sim-check", help="自建模拟器复现附件计时示例")
+    check.add_argument("--robot-id", default="2026001")
+    check.set_defaults(func=_sim_check)
+
+    run = subparsers.add_parser("run", help="P4 全向闭环（骨架）")
+    run.add_argument("--robot-id", required=True)
+    run.set_defaults(func=_run)
+
+    args = parser.parse_args(argv)
+    try:
+        return args.func(args)
+    except NotImplementedError as exc:
+        print(f"未实现: {exc}", file=sys.stderr)
+        return 2
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/src/mcm26b/config.py b/src/mcm26b/config.py
new file mode 100644
index 0000000..70eb864
--- /dev/null
+++ b/src/mcm26b/config.py
@@ -0,0 +1,88 @@
+"""全项目参数中心：题面常量、协议限制、会话策略与搜索规划参数。
+
+任何魔法数字只允许在这里出现一次。各模块通过 :class:`ProblemConfig` 读取；
+命令行需要覆盖时用 ``dataclasses.replace`` 派生新配置，不散落字面量。
+
+来源标注约定：
+- ``[题面]`` 出自 issue/B题.pdf、附件1《模拟器使用说明》、附件2《通信接口说明》原文；
+- ``[工程]`` 本队工程参数，可依演练实测调整，不代表官方规定。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+Vec2 = tuple[float, float]
+
+
+@dataclass(frozen=True)
+class FieldConfig:
+    """题目物理世界与协议硬限制。[题面]"""
+
+    omega_radius_m: float = 1800.0        # 目标区域半径，圆心为原点
+    channel_min: int = 1                  # 有效频道范围
+    channel_max: int = 20
+    source_count_min: int = 10            # 一局源总数范围（接口不直接告知）
+    source_count_max: int = 16
+    r_eff_min_m: float = 1000.0           # 有效接收半径下界：no_signal 只能排除该圆盘
+    r_eff_max_m: float = 1500.0           # 有效接收半径上界：direction 隐含距离上界
+    near_radius_m: float = 5.0            # "距离过近"阈值，不返回示向度
+    clear_radius_m: float = 20.0          # 清除半径；与定向朝向无关
+    bearing_error_half_deg: float = 1.0   # 示向度误差幅度（题设模型）
+    bearing_decimals: int = 2             # 返回示向度小数位
+    coord_abs_limit_m: float = 2_000_000.0   # 提交坐标的绝对值上限（超出返回 HTTP 400）
+    directional_half_angle_deg: float = 90.0  # 定向源朝向两侧各90度覆盖（含边界）
+    max_virtual_duration_s: float = 360_000.0  # 虚拟世界限时（100小时）
+    max_real_duration_s: float = 1200.0   # /enter 成功后程序运行上限（20分钟）
+    test_window_s: float = 1500.0         # 确认开始后的测试窗口（25分钟）
+
+
+@dataclass(frozen=True)
+class CostConfig:
+    """虚拟世界动作耗时模型。[题面] 附件1表1、附件2第4节。"""
+
+    speed_mps: float = 5.0       # 移动速度；耗时=直线距离/speed
+    measure_s: float = 5.0       # 每次检测动作耗时（无论结果）
+    switch_s: float = 1.0        # 任意两频道间切换耗时，仅由合法 /measure 触发
+    clear_success_s: float = 5.0  # 清除成功耗时 = 光学定位3s + 激光清除2s
+    clear_fail_s: float = 3.0    # 未发现可清除目标 = 仅光学定位3s
+
+
+@dataclass(frozen=True)
+class SessionConfig:
+    """会话与网络策略。arena/robot/request 规则为 [题面]，其余为 [工程]。"""
+
+    arena_id: str = "default"                  # [题面] 固定值
+    base_url: str = "http://127.0.0.1:2026"    # [题面] 模拟器默认接口地址
+    robot_id_max_bytes: int = 64               # [题面] UTF-8 长度 1..64
+    request_id_max_bytes: int = 128            # [题面] UTF-8 长度 1..128
+    request_body_max_bytes: int = 65_536       # [题面] 超出返回 HTTP 413
+    connect_timeout_s: float = 5.0             # [工程] 连接超时
+    read_timeout_s: float = 15.0               # [工程] 读超时；覆盖"服务器已处理但响应丢失"
+    max_attempts: int = 3                      # [工程] 单动作最多尝试次数（含首次）
+    retry_backoff_s: float = 0.25              # [工程] 重试退避基数，按 2^n 放大
+    reserve_exit_s: float = 60.0               # [工程] 预留退出与故障恢复的现实秒数
+    real_rtt_p95_s: float = 1.0                # [工程] 现实单请求高分位估计，预算核算用
+
+
+@dataclass(frozen=True)
+class SearchConfig:
+    """搜索与覆盖规划参数。[工程] 推导依据见 docs/B题建模分析与实施计划.md。"""
+
+    grid_step_m: float = 700.0        # P4 覆盖网格步长；单元对角 700*sqrt(2)≈989.95<=1000
+    grid_half_cells: int = 3          # i,j ∈ [-3,3]，49 点覆盖 [-2100,2100]^2 ⊇ Ω
+    fallback_clear_grid_m: float = 20.0  # P5 后备清除网格；10*sqrt(2)<=20
+    bearing_rounding_margin_deg: float = 0.0  # 默认不加舍入裕量；敏感性分析时显式设 0.005
+
+
+@dataclass(frozen=True)
+class ProblemConfig:
+    """聚合配置。各模块函数的第一个默认参数，便于单测替换。"""
+
+    field: FieldConfig = FieldConfig()
+    cost: CostConfig = CostConfig()
+    session: SessionConfig = SessionConfig()
+    search: SearchConfig = SearchConfig()
+
+
+DEFAULT_CONFIG = ProblemConfig()
diff --git a/src/mcm26b/coverage/__init__.py b/src/mcm26b/coverage/__init__.py
new file mode 100644
index 0000000..a2fa11a
--- /dev/null
+++ b/src/mcm26b/coverage/__init__.py
@@ -0,0 +1,56 @@
+"""P4 全域覆盖：49 点网格与逐频道覆盖记录。
+
+覆盖基线（推导见 docs/B题建模分析与实施计划.md §4）：
+S = {(700i, 700j) : i, j ∈ [-3,3]}，|S| = 49，覆盖 [-2100,2100]² ⊇ Ω，
+且允许访问目标圆域外（边界朝外发射的定向源不漏）。
+单元内任意点到 4 顶点距离 <= 700·√2 ≈ 989.95 <= 1000 <= 最小接收半径。
+
+验收标准：
+- "路过某点"不算"测过某频道"：必须按 (频道, 点) 二维记录；
+- 已清除/已定位频道可跳过剩余点，但跳过原因必须留痕；
+- 自适应跳点（P6）必须保留逐频道覆盖证据，否则不得启用。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+
+from ..config import ProblemConfig, Vec2
+
+
+def coverage_points(config: ProblemConfig = ProblemConfig()) -> list[Vec2]:
+    """49 点覆盖网格生成（纯几何，可独立测试）。"""
+    step = config.search.grid_step_m
+    half = config.search.grid_half_cells
+    return [(step * i, step * j)
+            for j in range(half, -half - 1, -1)
+            for i in range(-half, half + 1)]
+
+
+@dataclass
+class CoverageLedger:
+    """逐频道覆盖账本：(频道, 网格点) -> 是否已测。"""
+
+    config: ProblemConfig = field(default_factory=ProblemConfig)
+    points: list[Vec2] = field(default_factory=lambda: coverage_points())
+    measured: set = field(default_factory=set)          # {(channel, point_index)}
+    skipped: dict = field(default_factory=dict)         # channel -> 原因
+
+    def mark_measured(self, channel: int, point_index: int) -> None:
+        self.measured.add((channel, point_index))
+
+    def measured_at(self, channel: int, point_index: int) -> bool:
+        return (channel, point_index) in self.measured
+
+    def skip_channel(self, channel: int, reason: str) -> None:
+        """记录整频道跳过原因（如 already_cleared / located_pending_clear）。"""
+        self.skipped[channel] = reason
+
+    def pending_points(self, channel: int) -> list[int]:
+        """该频道尚未测量的网格点下标。扫描调度策略未实现（P4）。"""
+        return [index for index in range(len(self.points))
+                if not self.measured_at(channel, index)]
+
+    def coverage_complete(self, channel: int) -> bool:
+        """该频道覆盖是否完成（含显式跳过）。"""
+        return channel in self.skipped or not self.pending_points(channel)
diff --git a/src/mcm26b/evaluation/__init__.py b/src/mcm26b/evaluation/__init__.py
new file mode 100644
index 0000000..06bc9cd
--- /dev/null
+++ b/src/mcm26b/evaluation/__init__.py
@@ -0,0 +1,81 @@
+"""评估与统计：从自身动作日志离线复算虚拟时刻与统计量。
+
+"演练统计"验收要求：总时间与分项耗时可独立复算 [题面/计划 §6]。
+recompute_virtual_time 是回放测试与本模块共用的唯一复算实现，
+客户端日志格式为 SessionLog 中 accepted 事件的 {path, request, response}。
+"""
+
+from __future__ import annotations
+
+from ..config import CostConfig
+from ..protocol.rules import CLEAR_SUCCESS
+from ..protocol.timing import clear_cost, measure_cost
+
+
+def recompute_virtual_time(events: list[dict],
+                           cost: CostConfig = CostConfig()) -> dict:
+    """从动作日志复算逐步虚拟时刻。
+
+    events 每项形如 {path, request, response}（accepted=true）。
+    返回逐步表与最终时刻；任何一步与服务器响应偏差超过容差记入 mismatches。
+    """
+    position = (0.0, 0.0)
+    channel = 1
+    virtual = 0.0
+    steps, mismatches = [], []
+    for index, event in enumerate(events):
+        path, request = event["path"], event["request"]
+        response = event["response"]
+        if response.get("accepted") is not True:
+            mismatches.append({"index": index, "issue": "响应未被接受"})
+            continue
+        if path == "/enter":
+            position, channel, virtual = (0.0, 0.0), 1, response["virtual_time_s"]
+        elif path == "/measure":
+            pos = (request["position"]["x"], request["position"]["y"])
+            predicted = measure_cost(position, pos, channel, request["channel"], cost)
+            position, channel = pos, request["channel"]
+            virtual += predicted.total_s
+        elif path == "/clear":
+            pos = (request["position"]["x"], request["position"]["y"])
+            success = response.get("clear_result") == CLEAR_SUCCESS
+            predicted = clear_cost(position, pos, success, cost)
+            position = pos
+            virtual += predicted.total_s
+        elif path == "/exit":
+            pass  # /exit 不推进虚拟时钟 [题面]
+        else:
+            mismatches.append({"index": index, "issue": f"未知路径 {path}"})
+            continue
+        delta = response["virtual_time_s"] - virtual
+        if abs(delta) > 1e-6:
+            mismatches.append({"index": index, "path": path,
+                               "recomputed_s": virtual,
+                               "recorded_s": response["virtual_time_s"],
+                               "gap_s": delta})
+        steps.append({"index": index, "path": path,
+                      "predicted_s": round(virtual, 9),
+                      "recorded_s": response["virtual_time_s"]})
+    return {"steps": steps, "final_virtual_time_s": virtual,
+            "mismatches": mismatches}
+
+
+def summarize(events: list[dict]) -> dict:
+    """动作计数摘要：检测/清除/移动距离等基础统计。"""
+    position = (0.0, 0.0)
+    measures, clears, cleared, distance_m = 0, 0, 0, 0.0
+    for event in events:
+        request = event["request"]
+        if event["path"] in ("/measure", "/clear"):
+            pos = (request["position"]["x"], request["position"]["y"])
+            distance_m += ((pos[0] - position[0]) ** 2
+                           + (pos[1] - position[1]) ** 2) ** 0.5
+            position = pos
+        if event["path"] == "/measure":
+            measures += 1
+        elif event["path"] == "/clear":
+            clears += 1
+            if event["response"].get("clear_result") == CLEAR_SUCCESS:
+                cleared += 1
+    return {"measures": measures, "clears": clears, "cleared": cleared,
+            "distance_m": distance_m}
diff --git a/geometry/__init__.py b/src/mcm26b/geometry/__init__.py
similarity index 54%
rename from geometry/__init__.py
rename to src/mcm26b/geometry/__init__.py
index 0ece746..091e7e4 100644
--- a/geometry/__init__.py
+++ b/src/mcm26b/geometry/__init__.py
@@ -1,4 +1,7 @@
-"""B题问题一：有界误差方位交会定位。仅使用 Python 标准库。"""
+"""P2 几何内核：B题问题一有界误差方位交会定位。仅用标准库，已完工。
+
+问题二首次测向安全候选盘证书一并放在本包（planning 模块）。
+"""
 
 from .localization import Measurement, solve, smallest_enclosing_circle
 from .planning import first_bearing_candidate_disk
diff --git a/geometry/__main__.py b/src/mcm26b/geometry/__main__.py
similarity index 93%
rename from geometry/__main__.py
rename to src/mcm26b/geometry/__main__.py
index 627a3ad..1be7c0e 100644
--- a/geometry/__main__.py
+++ b/src/mcm26b/geometry/__main__.py
@@ -1,4 +1,4 @@
-"""python -m geometry observations.json [-o result.json]"""
+"""python -m mcm26b.geometry observations.json [-o result.json]"""
 
 import argparse
 import json
@@ -8,13 +8,13 @@ from pathlib import Path
 from .localization import Measurement, solve
 
 
-def main():
+def main(argv=None):
     parser = argparse.ArgumentParser(description="B题问题一：角域交、直径与包围圆")
     parser.add_argument("input", type=Path, help="包含measurements数组的JSON文件")
     parser.add_argument("-o", "--output", type=Path)
     parser.add_argument("--rounding-margin-deg", type=float, default=0,
                         help="额外误差半角，默认0；可显式设0.005进行舍入敏感性分析")
-    args = parser.parse_args()
+    args = parser.parse_args(argv)
     try:
         source = json.loads(args.input.read_text(encoding="utf-8-sig"))
         measurements = [Measurement(**row) for row in source["measurements"]]
diff --git a/geometry/localization.py b/src/mcm26b/geometry/localization.py
similarity index 100%
rename from geometry/localization.py
rename to src/mcm26b/geometry/localization.py
diff --git a/geometry/planning.py b/src/mcm26b/geometry/planning.py
similarity index 100%
rename from geometry/planning.py
rename to src/mcm26b/geometry/planning.py
diff --git a/src/mcm26b/planner/__init__.py b/src/mcm26b/planner/__init__.py
new file mode 100644
index 0000000..29cb3d9
--- /dev/null
+++ b/src/mcm26b/planner/__init__.py
@@ -0,0 +1,80 @@
+"""P3/P4/P5 策略层：主动选点、全向闭环与定向扩展。
+
+现状：骨架。各入口先固定签名与验收标准，逐阶段填充实现。
+
+P3 第二检测点（验收：保证收到信号；Q 空时退化；near 分支）：
+- K1 = Ω ∩ W(s1, θ1±δ) ∩ B(s1, 1500)；安全候选盘证书见
+  geometry.planning.first_bearing_candidate_disk（δ<=1.005° 时非空）；
+- 在证书圆盘内围绕测向轴两侧采样候选点，以"最坏后验包围圆半径"
+  为主指标、移动+检测代价为次指标；
+- 返回 near 时：候选源在 5m 内，直接对当前频道尝试 /clear。
+
+P4 全向闭环（验收：10/16 源正确退出；边界朝外不漏；停止条件正确）：
+发现（coverage.CoverageLedger）→ 定位（belief 收敛）→ 清除 → 停止判定
+（清除数达 16，或每频道均有清除成功/不存在证明）→ /exit。
+发现 10 源、连续无信号、候选采样为空都不是停止条件。
+
+P5 定向扩展（验收：朝外边界源能发现；失去信号能清除；不误删真源）：
+no_signal 是"位置×朝向"联合约束，基线不据此删空间候选；
+失去信号后对有界候选做 <=20m 有限圆盘覆盖逐点 /clear，
+并按预算上界（格数×请求耗时）决定是否执行。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from ..config import ProblemConfig
+from ..protocol.client import SimulatorClient
+
+
+@dataclass
+class SecondPointPlan:
+    """第二检测点的候选与依据（P3 输出形态预览）。"""
+
+    position: tuple[float, float]
+    worst_posterior_radius_m: float
+    move_cost_s: float
+    reason: str
+
+
+def select_second_point(client: SimulatorClient,
+                        first_position, first_bearing_deg: float,
+                        config: ProblemConfig = ProblemConfig()):
+    """在安全候选盘内选择第二检测点。未实现：P3。"""
+    raise NotImplementedError("P3：先实现 belief 候选集，再实现采样评估")
+
+
+class OmnidirectionalLoop:
+    """问题3全向"发现—定位—清除—停止"闭环。未实现：P4。"""
+
+    def __init__(self, client: SimulatorClient,
+                 config: ProblemConfig = ProblemConfig()):
+        self.client = client
+        self.config = config
+
+    def run(self) -> dict:
+        raise NotImplementedError("P4：依赖 coverage + belief + planner 就位")
+
+
+class DirectionalExtension:
+    """问题4定向源扩展：朝向不确定下的覆盖与后备清除。未实现：P5。"""
+
+    def __init__(self, client: SimulatorClient,
+                 config: ProblemConfig = ProblemConfig()):
+        self.client = client
+        self.config = config
+
+    def run(self) -> dict:
+        raise NotImplementedError("P5：依赖 P4 闭环稳定后扩展")
+
+
+def fallback_clear_cells(center, width_m: float, height_m: float,
+                         config: ProblemConfig = ProblemConfig()):
+    """失去信号后的后备清除格心列表（<=20m 圆盘覆盖）。
+
+    半开区间统一索引，源在格线上时至少归入一格；相交判定数值
+    不确定时保留格子（宁可多测）。格数即 /clear 请求预算上界。
+    未实现：P5（先由演练实测请求预算决定启用规模）。
+    """
+    raise NotImplementedError("P5")
diff --git a/src/mcm26b/protocol/__init__.py b/src/mcm26b/protocol/__init__.py
new file mode 100644
index 0000000..85bfdf2
--- /dev/null
+++ b/src/mcm26b/protocol/__init__.py
@@ -0,0 +1,15 @@
+"""P0/P1 协议层：字段表、规则表、计时模型、状态机与客户端。"""
+
+from .client import (ActionRejected, ClearOutcome, DeadlineExceeded,
+                     ExitInfo, MeasureOutcome, ProtocolError,
+                     ProtocolViolation, SimulatorClient)
+from .log import SessionLog
+from .state import RobotState, StateError
+from .timing import CostBreakdown, clear_cost, measure_cost, move_time
+from .transport import RequestsTransport, Transport, TransportError, TransportResponse
+
+__all__ = ["ActionRejected", "ClearOutcome", "CostBreakdown", "DeadlineExceeded",
+           "ExitInfo", "MeasureOutcome", "ProtocolError", "ProtocolViolation",
+           "RequestsTransport", "RobotState", "SessionLog", "SimulatorClient",
+           "StateError", "Transport", "TransportError", "TransportResponse",
+           "clear_cost", "measure_cost", "move_time"]
diff --git a/src/mcm26b/protocol/client.py b/src/mcm26b/protocol/client.py
new file mode 100644
index 0000000..460d089
--- /dev/null
+++ b/src/mcm26b/protocol/client.py
@@ -0,0 +1,288 @@
+"""P1 协议基线：串行、幂等、带现实预算的模拟器客户端。
+
+协议硬规则 [题面] 与实现对应：
+- 每个新动作使用新的 request_id；仅在网络失败后重试"完全相同的动作"时，
+  复用原 request_id 与原请求体 —— 本类通过一次性序列化出 bytes 并原样重发保证；
+- 必须同时检查 HTTP 状态与 accepted；accepted=false 不更新状态，
+  其 virtual_time_s=0 不当作当前虚拟时刻；
+- 逐次等待响应、不得并发；本类完全同步，一个动作未决不发起下一个；
+- 现实截止用 /enter 响应的 remaining_real_duration_s 建立本地单调时钟，
+  预留退出余量；/exit 不做预算拦截。
+"""
+
+from __future__ import annotations
+
+import json
+import uuid
+from dataclasses import dataclass
+from time import monotonic, sleep
+
+from ..config import ProblemConfig, Vec2
+from .log import SessionLog
+from .rules import (CLEAR_RESULTS, DIRECTION, EXIT_USER, MEASURE_RESULTS,
+                    POSITION_FIELDS, STATUS_OK, STATUS_RETRYABLE)
+from .state import RobotState
+from .timing import CostBreakdown
+from .transport import RequestsTransport, Transport, TransportError
+
+
+class ProtocolError(RuntimeError):
+    """协议层失败，含 HTTP 状态与响应体；默认不重试（确定性错误）。"""
+
+    def __init__(self, message: str, status: int | None = None, body=None):
+        super().__init__(message)
+        self.status = status
+        self.body = body
+
+
+class ActionRejected(ProtocolError):
+    """HTTP 200 但 accepted=false：动作未生效，状态不得更新。"""
+
+    def __init__(self, message: str, body=None):
+        super().__init__(message, status=STATUS_OK, body=body)
+
+
+class ProtocolViolation(ProtocolError):
+    """响应与协议约定不符（字段缺失、值非法、虚拟时刻回退等）。"""
+
+
+class DeadlineExceeded(RuntimeError):
+    """现实预算不足：预留退出余量后剩余时间不够执行新动作。"""
+
+
+@dataclass(frozen=True)
+class MeasureOutcome:
+    result: str
+    svd_deg: float | None
+    virtual_time_s: float
+    predicted: CostBreakdown
+    raw: dict
+
+
+@dataclass(frozen=True)
+class ClearOutcome:
+    result: str
+    virtual_time_s: float
+    predicted: CostBreakdown
+    raw: dict
+
+
+@dataclass(frozen=True)
+class ExitInfo:
+    reason: str
+    virtual_time_s: float
+    raw: dict
+
+
+def _validate_identifier(name: str, value: str, max_bytes: int) -> None:
+    if not isinstance(value, str) or not value:
+        raise ValueError(f"{name} 必须是非空字符串")
+    encoded = value.encode("utf-8")
+    if not 1 <= len(encoded) <= max_bytes:
+        raise ValueError(f"{name} 的 UTF-8 长度须在 1..{max_bytes} 字节")
+    if any(code < 0x20 or code == 0x7F for code in encoded):
+        raise ValueError(f"{name} 不能包含控制字符")
+
+
+def _validate_position(position: dict, limit: float) -> None:
+    if set(position) != set(POSITION_FIELDS):
+        raise ValueError("position 字段必须是且只能是 x、y")
+    for key in ("x", "y"):
+        value = position[key]
+        if isinstance(value, bool) or not isinstance(value, (int, float)):
+            raise ValueError(f"position.{key} 必须是数值")
+        if value != value or value in (float("inf"), float("-inf")):
+            raise ValueError(f"position.{key} 必须是有限数值")
+        if abs(value) > limit:
+            raise ValueError(f"position.{key} 绝对值不得超过 {limit} 米")
+
+
+def _validate_channel(channel) -> int:
+    # 写成 JSON number 1.0 且恰为整数也接受 [题面]；1.5 拒绝。
+    if isinstance(channel, bool) or not isinstance(channel, (int, float)):
+        raise ValueError("channel 必须是数值")
+    if isinstance(channel, float) and not channel.is_integer():
+        raise ValueError("channel 必须是整数")
+    channel = int(channel)
+    if not 1 <= channel <= 20:
+        raise ValueError("channel 必须在 1..20 范围内")
+    return channel
+
+
+class SimulatorClient:
+    """四条指令的同步客户端。状态只在 accepted=true 后推进。"""
+
+    def __init__(self, robot_id: str, *,
+                 config: ProblemConfig = ProblemConfig(),
+                 transport: Transport | None = None,
+                 log: SessionLog | None = None,
+                 clock=monotonic):
+        _validate_identifier("robot_id", robot_id, config.session.robot_id_max_bytes)
+        self.robot_id = robot_id
+        self.config = config
+        self.session = config.session
+        self.transport = transport if transport is not None else RequestsTransport()
+        self.log = log if log is not None else SessionLog()
+        self.clock = clock
+        self.state = RobotState()
+        self._prefix = uuid.uuid4().hex[:12]
+        self._seq = 0
+        self._deadline: float | None = None          # 本地单调时钟截止
+        self._server_deadline_ms: float | None = None  # 服务器时间戳交叉核对
+
+    # ------------------------------------------------------------ 公共动作 API
+    def enter(self) -> dict:
+        response = self._call("/enter", self._payload("/enter"))
+        self.state.apply_enter(response)
+        remaining = response["remaining_real_duration_s"]
+        if not isinstance(remaining, (int, float)) or remaining <= 0:
+            raise ProtocolViolation("remaining_real_duration_s 缺失或非法", body=response)
+        self._deadline = self.clock() + remaining
+        self._server_deadline_ms = (response["real_timestamp_ms"]
+                                    + remaining * 1000.0)
+        return response
+
+    def measure(self, position: Vec2, channel: int) -> MeasureOutcome:
+        payload = self._payload("/measure", position=position, channel=channel)
+        response = self._call("/measure", payload)
+        predicted = self.state.apply_measure(payload, response,
+                                             cost=self.config.cost)
+        result = response.get("measure_result")
+        if result not in MEASURE_RESULTS:
+            raise ProtocolViolation(f"measure_result 非法: {result!r}", body=response)
+        svd = response.get("svd_deg")
+        if result == DIRECTION:
+            if not isinstance(svd, (int, float)) or isinstance(svd, bool):
+                raise ProtocolViolation("direction 响应缺少数值 svd_deg", body=response)
+        return MeasureOutcome(result, float(svd) if svd is not None else None,
+                              response["virtual_time_s"], predicted, response)
+
+    def clear(self, position: Vec2, channel: int) -> ClearOutcome:
+        payload = self._payload("/clear", position=position, channel=channel)
+        response = self._call("/clear", payload)
+        predicted = self.state.apply_clear(payload, response,
+                                           cost=self.config.cost)
+        result = response.get("clear_result")
+        if result not in CLEAR_RESULTS:
+            raise ProtocolViolation(f"clear_result 非法: {result!r}", body=response)
+        return ClearOutcome(result, response["virtual_time_s"], predicted, response)
+
+    def exit(self) -> ExitInfo:
+        response = self._call("/exit", self._payload("/exit"))
+        self.state.apply_exit(response)
+        reason = response.get("exit_reason")
+        if reason != EXIT_USER:
+            raise ProtocolViolation(f"exit_reason 非法: {reason!r}", body=response)
+        return ExitInfo(reason, response["virtual_time_s"], response)
+
+    # ---------------------------------------------------------------- 预算控制
+    @property
+    def real_remaining_s(self) -> float | None:
+        """按本地单调时钟估计的剩余现实秒数（未 enter 时为 None）。"""
+        return None if self._deadline is None else self._deadline - self.clock()
+
+    def _check_budget(self, path: str) -> None:
+        if path == "/exit" or self._deadline is None:
+            return
+        margin = self.session.reserve_exit_s
+        if self.real_remaining_s <= margin:
+            raise DeadlineExceeded(
+                f"剩余现实时间 {self.real_remaining_s:.1f}s 不足以预留 {margin:.1f}s 退出余量")
+
+    # ---------------------------------------------------------------- 内部机制
+    def _payload(self, path: str, *, position: Vec2 | None = None,
+                 channel: int | None = None) -> dict:
+        payload = {"arena_id": self.session.arena_id,
+                   "robot_id": self.robot_id,
+                   "request_id": self._next_request_id()}
+        if position is not None:
+            x, y = float(position[0]), float(position[1])
+            _validate_position({"x": x, "y": y}, self.config.field.coord_abs_limit_m)
+            payload["position"] = {"x": x, "y": y}
+        if channel is not None:
+            payload["channel"] = _validate_channel(channel)
+        return payload
+
+    def _next_request_id(self) -> str:
+        self._seq += 1
+        request_id = f"{self._prefix}-{self._seq:04d}"
+        _validate_identifier("request_id", request_id,
+                             self.session.request_id_max_bytes)
+        return request_id
+
+    def _call(self, path: str, payload: dict) -> dict:
+        """串行执行一个动作；网络失败原样重发，HTTP 确定性错误立即抛出。"""
+        self._check_budget(path)
+        body = json.dumps(payload, ensure_ascii=False, allow_nan=False).encode("utf-8")
+        if len(body) > self.session.request_body_max_bytes:
+            raise ValueError("请求体超过 65536 字节")
+        headers = {"Content-Type": "application/json"}
+        url = self.session.base_url + path
+        attempts, last_error = 0, None
+        while attempts < self.session.max_attempts:
+            attempts += 1
+            started = self.clock()
+            self.log.append({"event": "attempt", "path": path,
+                             "request_id": payload["request_id"],
+                             "attempt": attempts, "request": payload})
+            try:
+                result = self.transport.post(
+                    url, body, headers,
+                    timeout=(self.session.connect_timeout_s,
+                             self.session.read_timeout_s))
+            except TransportError as exc:
+                last_error = exc
+                self.log.append({"event": "transport_error", "path": path,
+                                 "request_id": payload["request_id"],
+                                 "attempt": attempts, "error": str(exc),
+                                 "elapsed_s": self.clock() - started})
+                if attempts < self.session.max_attempts:
+                    sleep(self.session.retry_backoff_s * (2 ** (attempts - 1)))
+                continue
+            if result.status in STATUS_RETRYABLE:
+                self.log.append({"event": "retryable_status", "path": path,
+                                 "request_id": payload["request_id"],
+                                 "attempt": attempts, "status": result.status})
+                if attempts < self.session.max_attempts:
+                    sleep(self.session.retry_backoff_s * (2 ** (attempts - 1)))
+                continue
+            if result.status != STATUS_OK:
+                raise ProtocolError(
+                    f"{path} 返回 HTTP {result.status}", status=result.status,
+                    body=self._safe_json(result.body))
+            response = self._safe_json(result.body)
+            if response is None or response.get("accepted") is not True:
+                raise ActionRejected(
+                    f"{path} 未被接受: {response}", body=response)
+            self._verify_clock(response)
+            self.log.append({"event": "accepted", "path": path,
+                             "request_id": payload["request_id"],
+                             "request": payload, "response": response,
+                             "attempts": attempts,
+                             "elapsed_s": self.clock() - started})
+            return response
+        raise TransportError(
+            f"{path} 重试 {attempts} 次仍失败: {last_error}") from last_error
+
+    def _verify_clock(self, response: dict) -> None:
+        """accepted=true 的虚拟时刻必须单调不减；现实时间戳用于漂移核对。"""
+        virtual = response.get("virtual_time_s")
+        if not isinstance(virtual, (int, float)) or isinstance(virtual, bool):
+            raise ProtocolViolation("accepted 响应缺少 virtual_time_s", body=response)
+        if virtual < self.state.virtual_time_s - 1e-9:
+            raise ProtocolViolation(
+                f"虚拟时刻回退: {self.state.virtual_time_s} -> {virtual}",
+                body=response)
+        if self._server_deadline_ms is not None:
+            drift = (self._server_deadline_ms - response["real_timestamp_ms"]) / 1000.0
+            if drift < self.session.reserve_exit_s / 2:
+                # 服务器视角余量告急（本地时钟漂移或请求排队）；仅记录，交由上层决策。
+                self.log.append({"event": "server_time_warning",
+                                 "server_remaining_s": drift})
+
+    @staticmethod
+    def _safe_json(body: bytes):
+        try:
+            return json.loads(body.decode("utf-8"))
+        except (UnicodeDecodeError, json.JSONDecodeError):
+            return None
diff --git a/src/mcm26b/protocol/log.py b/src/mcm26b/protocol/log.py
new file mode 100644
index 0000000..e060ede
--- /dev/null
+++ b/src/mcm26b/protocol/log.py
@@ -0,0 +1,34 @@
+"""会话日志：机器狗程序必须自行记录指令序列与响应 [题面] 附件2 12节。
+
+事件逐条追加写入 JSONL，进程崩溃时已完成的动作不丢；
+内存中的 events 同时供回放测试与 evaluation 复算使用。
+"""
+
+from __future__ import annotations
+
+import json
+from dataclasses import dataclass, field
+from pathlib import Path
+from time import time
+
+
+@dataclass
+class SessionLog:
+    path: Path | None = None
+    events: list = field(default_factory=list)
+
+    def __post_init__(self):
+        if self.path is not None:
+            self.path.parent.mkdir(parents=True, exist_ok=True)
+
+    def append(self, event: dict) -> None:
+        event = {**event, "logged_at_unix_s": time()}
+        self.events.append(event)
+        if self.path is not None:
+            with self.path.open("a", encoding="utf-8") as handle:
+                handle.write(json.dumps(event, ensure_ascii=False, allow_nan=False) + "\n")
+
+    def action_events(self) -> list[dict]:
+        """仅最终被接受的动作事件（每个 request_id 一条，含重试次数）。"""
+        return [event for event in self.events if event.get("response") is not None
+                and event["response"].get("accepted") is True]
diff --git a/src/mcm26b/protocol/rules.py b/src/mcm26b/protocol/rules.py
new file mode 100644
index 0000000..8e89aea
--- /dev/null
+++ b/src/mcm26b/protocol/rules.py
@@ -0,0 +1,94 @@
+"""P0 规则固定：四条指令的字段表、结果码与错误语义，全部落成可执行数据。
+
+依据 issue/附件/附件2.docx《模拟器通信接口说明及编程指南》第 5-9 节。
+客户端用它构造与预校验请求，自建模拟器用它校验并拒绝未知字段；
+表格本身即交付物"字段表/规则表"，人类可读版本见 docs/协议规则与状态机.md。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+# ---- 结果码 [题面] ----------------------------------------------------------
+
+NO_SIGNAL = "no_signal"    # 收不到信号：无未清除源 / 超接收半径 / 定向覆盖角外
+NEAR = "near"              # 距离 <=5m 且在覆盖角内；不返回 svd_deg
+DIRECTION = "direction"    # 有信号；附 svd_deg（含 ±1° 误差，保留两位小数）
+MEASURE_RESULTS = (NO_SIGNAL, NEAR, DIRECTION)
+
+CLEAR_SUCCESS = "success"                # 20m 内发现并清除；耗时 5s
+CLEAR_NO_TARGET = "no_target_in_range"   # 未发现（无源/已清除/超20m）；耗时 3s
+CLEAR_RESULTS = (CLEAR_SUCCESS, CLEAR_NO_TARGET)
+
+EXIT_USER = "user_exit"    # /exit 成功响应中的固定退出原因
+
+# accepted=false 的响应只含这 3 个字段；virtual_time_s 恒为 0，不是当前时刻 [题面]
+BASE_RESPONSE_FIELDS = ("accepted", "real_timestamp_ms", "virtual_time_s")
+
+
+# ---- 请求字段表 --------------------------------------------------------------
+
+
+@dataclass(frozen=True)
+class FieldSpec:
+    """单个请求字段的约束。[题面] 附件2 5.1 节与各指令小节。"""
+
+    kind: type                    # str / dict；数值字段由 sim 按整型/浮点细则单独校验
+    required: bool = True
+    max_bytes: int | None = None  # 字符串字段的 UTF-8 长度上限
+
+
+COMMON_FIELDS: dict[str, FieldSpec] = {
+    "arena_id": FieldSpec(str),        # 必须为 "default"
+    "robot_id": FieldSpec(str, max_bytes=64),    # 逐字节等于登录参赛队号
+    "request_id": FieldSpec(str, max_bytes=128), # 会话内幂等键，新动作用新 ID
+}
+
+POSITION_FIELDS: dict[str, FieldSpec] = {
+    "x": FieldSpec(float),   # 有限 JSON number，|x| <= 2_000_000
+    "y": FieldSpec(float),
+}
+
+# 路径 -> 除公共字段外的动作字段；/enter 与 /exit 无附加字段
+ACTION_FIELDS: dict[str, dict[str, FieldSpec]] = {
+    "/enter": {},
+    "/measure": {"position": FieldSpec(dict), "channel": FieldSpec(float)},
+    "/clear": {"position": FieldSpec(dict), "channel": FieldSpec(float)},
+    "/exit": {},
+}
+ACTION_PATHS = tuple(ACTION_FIELDS)
+
+# channel 写成 JSON number 1.0 且恰为整数也接受；1.5 返回 HTTP 400 [题面]
+
+
+# ---- 响应字段表（accepted=true 时的附加字段） --------------------------------
+
+RESPONSE_FIELDS: dict[str, tuple[str, ...]] = {
+    "/enter": ("max_virtual_duration_s", "max_real_duration_s", "remaining_real_duration_s"),
+    "/measure": ("measure_result",),              # direction 时另有 svd_deg
+    "/clear": ("clear_result",),
+    "/exit": ("exit_reason",),
+}
+
+
+# ---- 错误语义 [题面] 附件2 5.3 节 --------------------------------------------
+
+STATUS_OK = 200
+STATUS_BAD_REQUEST = 400            # JSON 语法/重复键/缺字段/类型/频道或坐标范围
+STATUS_CONFLICT = 409               # 同 request_id 对应不同动作，或并发不同动作
+STATUS_RETRYABLE = (429, 500)       # 流量保护/幂等记录上限、服务器内部错误：可原样重试
+
+
+def http_status_meaning(status: int) -> str:
+    table = {
+        200: "动作已执行，或 JSON 合法但被业务拒绝（看 accepted）",
+        400: "请求结构错误；不占用 request_id，修正后可复用该 ID",
+        404: "路径未知或不精确（不接受尾随斜线与查询参数）",
+        405: "已知路径使用了非 POST 方法",
+        409: "request_id 幂等冲突或并发发送不同动作",
+        413: "请求体超过 65536 字节",
+        415: "Content-Type 或 Content-Encoding 不受支持",
+        429: "连接/流量保护触发，或本局幂等记录达到上限",
+        500: "模拟器内部错误",
+    }
+    return table.get(status, "未知状态码")
diff --git a/src/mcm26b/protocol/state.py b/src/mcm26b/protocol/state.py
new file mode 100644
index 0000000..7788266
--- /dev/null
+++ b/src/mcm26b/protocol/state.py
@@ -0,0 +1,97 @@
+"""P0/P1 机器狗本地状态机：位置、测向频道、虚拟时刻与进出状态。
+
+更新规则 [题面]：
+- 只有 accepted=true 的响应才允许调用 apply_*；accepted=false 一律不更新，
+  其 virtual_time_s=0 不是当前虚拟时刻；
+- 虚拟时刻以最近一次 accepted=true 的响应为准，本地预测值仅作一致性核对；
+- /clear 不改变测向机当前频道，也不产生切换耗时；
+- 只有合法 /measure 会把测向机频道更新为本次检测频道。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+
+from ..config import CostConfig, Vec2
+from .rules import CLEAR_SUCCESS
+from .timing import CostBreakdown, clear_cost, measure_cost
+
+
+class StateError(RuntimeError):
+    """状态机被以非法顺序驱动（例如未 enter 就 apply_measure）。"""
+
+
+@dataclass
+class RobotState:
+    position: Vec2 = (0.0, 0.0)   # /enter 成功后的初始位置 [题面]
+    channel: int = 1              # /enter 成功后的初始频道 [题面]
+    virtual_time_s: float = 0.0
+    entered: bool = False
+    exited: bool = False
+    action_count: int = 0
+    # 预测与实测的偏差记录；strict 模式下出现偏差会直接抛错。
+    mismatches: list = field(default_factory=list)
+
+    # -------------------------------------------------------------- enter/exit
+    def apply_enter(self, response: dict, *, strict: bool = False) -> None:
+        self._require_accepted(response)
+        if strict and (self.entered or self.exited):
+            raise StateError("重复 /enter 或已退出后再 enter")
+        self.entered = True
+        self.virtual_time_s = response["virtual_time_s"]
+
+    def apply_exit(self, response: dict) -> None:
+        self._require_accepted(response)
+        self.exited = True
+        self.virtual_time_s = response["virtual_time_s"]
+
+    # ----------------------------------------------------------------- measure
+    def apply_measure(self, request: dict, response: dict, *,
+                      cost: CostConfig = CostConfig(),
+                      strict: bool = False) -> CostBreakdown:
+        self._require_accepted(response)
+        if strict and (not self.entered or self.exited):
+            raise StateError("/measure 要求已 enter 且未退出")
+        pos = (request["position"]["x"], request["position"]["y"])
+        channel = request["channel"]
+        predicted = measure_cost(self.position, pos, self.channel, channel, cost)
+        predicted = self._advance(pos, channel, response, predicted, strict)
+        return predicted
+
+    # ------------------------------------------------------------------- clear
+    def apply_clear(self, request: dict, response: dict, *,
+                    cost: CostConfig = CostConfig(),
+                    strict: bool = False) -> CostBreakdown:
+        self._require_accepted(response)
+        if strict and (not self.entered or self.exited):
+            raise StateError("/clear 要求已 enter 且未退出")
+        pos = (request["position"]["x"], request["position"]["y"])
+        success = response["clear_result"] == CLEAR_SUCCESS
+        predicted = clear_cost(self.position, pos, success, cost)
+        # 频道保持不变：/clear 不切换测向机频道 [题面]
+        return self._advance(pos, self.channel, response, predicted, strict)
+
+    # ------------------------------------------------------------------ 共用
+    def _advance(self, pos: Vec2, channel: int, response: dict,
+                 predicted: CostBreakdown, strict: bool) -> CostBreakdown:
+        # 先完成全部校验再落子：strict 模式下失败时不留半更新状态。
+        actual_delta = response["virtual_time_s"] - self.virtual_time_s
+        if abs(actual_delta - predicted.total_s) > 1e-6:
+            message = (f"耗时预测不一致: 预测 {predicted.total_s:.6f}s, "
+                       f"实测 {actual_delta:.6f}s ({predicted})")
+            if strict:
+                raise StateError(message)
+            # 非严格模式：状态仍以响应为准，偏差记入日志供复盘。
+            self.mismatches.append(
+                {"action": self.action_count + 1, "predicted_s": predicted.total_s,
+                 "actual_s": actual_delta, "message": message})
+        self.position = pos
+        self.channel = channel
+        self.virtual_time_s = response["virtual_time_s"]
+        self.action_count += 1
+        return predicted
+
+    @staticmethod
+    def _require_accepted(response: dict) -> None:
+        if response.get("accepted") is not True:
+            raise StateError("accepted=false 的响应不允许更新状态")
diff --git a/src/mcm26b/protocol/timing.py b/src/mcm26b/protocol/timing.py
new file mode 100644
index 0000000..52a74d1
--- /dev/null
+++ b/src/mcm26b/protocol/timing.py
@@ -0,0 +1,55 @@
+"""P0 纯计时模型：/measure 与 /clear 的耗时分解，不涉及网络与状态。
+
+附件1表2 与附件2第10节的计时示例是唯一权威锚点：
+逐步得到 105、111、194、199 秒（tests/test_protocol_timing.py 固化）。
+客户端用本模块预测动作代价，模拟器用同一函数推进虚拟时钟，
+保证"预测-执行-复算"三方一致。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from math import dist
+
+from ..config import CostConfig, Vec2
+
+
+@dataclass(frozen=True)
+class CostBreakdown:
+    """一次合法动作的三段耗时 [题面]：移动 + 换频道（仅检测）+ 动作本身。"""
+
+    move_s: float
+    switch_s: float
+    action_s: float
+
+    @property
+    def total_s(self) -> float:
+        return self.move_s + self.switch_s + self.action_s
+
+
+def measure_cost(prev_pos: Vec2, pos: Vec2, prev_channel: int, channel: int,
+                 cost: CostConfig = CostConfig()) -> CostBreakdown:
+    """合法 /measure 的耗时。移动按直线距离；换频道只看前后频道是否不同。"""
+    return CostBreakdown(
+        move_s=dist(prev_pos, pos) / cost.speed_mps,
+        switch_s=0.0 if channel == prev_channel else cost.switch_s,
+        action_s=cost.measure_s,
+    )
+
+
+def clear_cost(prev_pos: Vec2, pos: Vec2, success: bool,
+               cost: CostConfig = CostConfig()) -> CostBreakdown:
+    """合法 /clear 的耗时。
+
+    /clear 的 channel 是目标干扰源频道，不切换测向机频道，也不产生换频道耗时 [题面]。
+    """
+    return CostBreakdown(
+        move_s=dist(prev_pos, pos) / cost.speed_mps,
+        switch_s=0.0,
+        action_s=cost.clear_success_s if success else cost.clear_fail_s,
+    )
+
+
+def move_time(a: Vec2, b: Vec2, cost: CostConfig = CostConfig()) -> float:
+    """任意两点间的移动耗时（规划用）。"""
+    return dist(a, b) / cost.speed_mps
diff --git a/src/mcm26b/protocol/transport.py b/src/mcm26b/protocol/transport.py
new file mode 100644
index 0000000..0f0f4b5
--- /dev/null
+++ b/src/mcm26b/protocol/transport.py
@@ -0,0 +1,44 @@
+"""传输抽象：HTTP 细节与协议客户端解耦，便于故障注入与本地模拟。
+
+真实运行用 :class:`RequestsTransport`；自建模拟器经 :class:`LocalSimTransport`
+（sim 模块）挂载；回放用 PlaybackTransport。连接失败与读超时统一抛
+:class:`TransportError` —— 此类失败后重试"同一动作"必须复用原 request_id
+与原请求体 [题面]，由 client 层保证。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+import requests
+
+
+class TransportError(Exception):
+    """网络层失败：连接不上、读写超时。动作可能未送达，也可能结果未知。"""
+
+
+@dataclass(frozen=True)
+class TransportResponse:
+    status: int
+    body: bytes
+
+
+class Transport:
+    """最小 POST 接口。同步阻塞，一次一个请求（协议要求串行）。"""
+
+    def post(self, url: str, body: bytes, headers: dict[str, str],
+             timeout: tuple[float, float]) -> TransportResponse:
+        raise NotImplementedError
+
+
+class RequestsTransport(Transport):
+    """基于 requests 的默认实现。timeout=(连接, 读取)。"""
+
+    def post(self, url, body, headers, timeout):
+        try:
+            response = requests.post(url, data=body, headers=headers, timeout=timeout)
+        except (requests.exceptions.Timeout, requests.exceptions.ConnectionError) as exc:
+            raise TransportError(str(exc)) from exc
+        except requests.exceptions.RequestException as exc:  # 其它请求级异常同样按网络失败处理
+            raise TransportError(str(exc)) from exc
+        return TransportResponse(response.status_code, response.content)
diff --git a/src/mcm26b/sim/__init__.py b/src/mcm26b/sim/__init__.py
new file mode 100644
index 0000000..810712d
--- /dev/null
+++ b/src/mcm26b/sim/__init__.py
@@ -0,0 +1,8 @@
+"""自建模拟器与测试侧传输：只对测试端开放真值，策略端仅见观测。"""
+
+from .playback import PlaybackTransport
+from .simulator import LocalSimulator, Source
+from .transport import LocalSimTransport, ScriptedFaultTransport
+
+__all__ = ["LocalSimTransport", "LocalSimulator", "PlaybackTransport",
+           "ScriptedFaultTransport", "Source"]
diff --git a/src/mcm26b/sim/playback.py b/src/mcm26b/sim/playback.py
new file mode 100644
index 0000000..c5a2469
--- /dev/null
+++ b/src/mcm26b/sim/playback.py
@@ -0,0 +1,38 @@
+"""回放传输：把既有演练日志作为服务器响应原样回放给客户端。
+
+用于 P1 验收"本地状态机与官方响应一致"：官方演练记录
+（output/q1/practice/*_actions.json）逐条喂给客户端，客户端重建的
+状态必须与当时服务器返回的虚拟时刻逐步吻合。
+
+按录制顺序匹配（客户端的 request_id 生成规则与采集器不同，
+故不参与匹配；故障重试场景请用 ScriptedFaultTransport）。
+"""
+
+from __future__ import annotations
+
+import json
+from urllib.parse import urlsplit
+
+from ..protocol.transport import Transport, TransportResponse
+
+
+class PlaybackTransport(Transport):
+    """events: 演练日志 [{path, request, response, ...}, ...]。"""
+
+    def __init__(self, events: list[dict]):
+        self.events = list(events)
+        self.index = 0
+        self.served: list[dict] = []
+
+    def post(self, url, body, headers, timeout):
+        if self.index >= len(self.events):
+            raise AssertionError("回放日志已耗尽仍有请求")
+        event = self.events[self.index]
+        path = urlsplit(url).path
+        if path != event["path"]:
+            raise AssertionError(
+                f"回放顺序不一致: 客户端请求 {path}, 录制预期 {event['path']}")
+        self.index += 1
+        self.served.append(event)
+        return TransportResponse(
+            200, json.dumps(event["response"], ensure_ascii=False).encode("utf-8"))
diff --git a/src/mcm26b/sim/simulator.py b/src/mcm26b/sim/simulator.py
new file mode 100644
index 0000000..657e7f8
--- /dev/null
+++ b/src/mcm26b/sim/simulator.py
@@ -0,0 +1,231 @@
+"""自建本地模拟器：按附件1/2语义复现官方模拟器的可观测行为。
+
+用途（P1 验收"自建回放测试"）：不依赖官方模拟器即可测试客户端、
+故障恢复与后续策略。真值 Source 只对测试端开放，策略端只能拿到响应。
+
+与官方实现的边界：本类只承诺"协议可观测行为一致"（响应字段、
+耗时推进、幂等与拒绝语义）；示向度误差分布是测试假设，不代表官方实现。
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+from dataclasses import dataclass, field
+from math import atan2, degrees, hypot, isfinite
+from random import Random
+from time import time
+
+from ..config import ProblemConfig
+from ..protocol.rules import (ACTION_FIELDS, CLEAR_NO_TARGET, CLEAR_RESULTS,
+                              CLEAR_SUCCESS, COMMON_FIELDS, DIRECTION,
+                              EXIT_USER, MEASURE_RESULTS, NEAR, NO_SIGNAL,
+                              POSITION_FIELDS)
+from ..protocol.timing import clear_cost, measure_cost
+
+
+@dataclass(frozen=True)
+class Source:
+    """一局真值。每个频道最多一个源 [题面]；构造时强制检查。"""
+
+    channel: int
+    x: float
+    y: float
+    r_eff_m: float                    # 有效接收半径，题目范围 1000..1500
+    directional: bool = False
+    heading_deg: float = 0.0          # 定向源朝向；全向源忽略
+
+
+class LocalSimulator:
+    """handle(path, payload) -> (http_status, body_dict)。"""
+
+    def __init__(self, sources: list[Source], *, robot_id: str = "2026001",
+                 config: ProblemConfig = ProblemConfig(),
+                 error_half_deg: float | None = None, error_seed: int = 20260910,
+                 rtt_ms: float = 40.0):
+        channels = [s.channel for s in sources]
+        if len(channels) != len(set(channels)):
+            raise ValueError("每个频道最多对应一个干扰源")
+        for s in sources:
+            if not (config.field.channel_min <= s.channel <= config.field.channel_max):
+                raise ValueError("频道超出 1..20")
+            if not s.directional and s.heading_deg != 0.0:
+                raise ValueError("全向源不应有朝向")
+        self.sources = list(sources)
+        self.robot_id = robot_id
+        self.config = config
+        self.field = config.field
+        self.cost = config.cost
+        self.error_half_deg = (self.field.bearing_error_half_deg
+                               if error_half_deg is None else error_half_deg)
+        self._rng = Random(error_seed)
+        self._rtt_ms = rtt_ms
+        self.entered = False
+        self.exited = False
+        self.position = (0.0, 0.0)
+        self.channel = self.field.channel_min
+        self.virtual_time_s = 0.0
+        self.cleared: set[int] = set()
+        self._idempotency: dict[str, tuple[str, int, dict]] = {}  # id -> (指纹, 状态码, 响应)
+
+    # ------------------------------------------------------------------ 主入口
+    def handle(self, path: str, payload) -> tuple[int, dict]:
+        if path not in ACTION_FIELDS:
+            return 404, self._reject(path)
+        if not isinstance(payload, dict):
+            return 400, self._reject(path)
+        # 1) 公共字段存在性与类型（缺失/类型错 -> 400 [题面]）
+        for name, spec in COMMON_FIELDS.items():
+            value = payload.get(name)
+            if not isinstance(value, str) or (spec.max_bytes
+                                              and len(value.encode("utf-8")) > spec.max_bytes):
+                return 400, self._reject(path)
+            if not value:
+                return 400, self._reject(path)
+        # 2) 动作字段存在性 -> 400
+        spec = ACTION_FIELDS[path]
+        for name in spec:
+            if name not in payload:
+                return 400, self._reject(path)
+        # 3) 未知字段 -> 200 accepted=false（不占用 request_id [题面]）
+        known = set(COMMON_FIELDS) | set(spec)
+        if set(payload) != known:
+            return 200, self._not_accepted()
+        # 4) arena / robot 不匹配 -> 200 accepted=false（不占用 request_id [题面]）
+        if payload["arena_id"] != "default" or payload["robot_id"] != self.robot_id:
+            return 200, self._not_accepted()
+        # 4.5) position 下的未知字段同样 -> 200 accepted=false [题面 7.4]
+        if path in ("/measure", "/clear"):
+            position = payload.get("position")
+            if isinstance(position, dict) and set(position) - set(POSITION_FIELDS):
+                return 200, self._not_accepted()
+        # 5) 幂等：同一 ID 同一内容回放首次响应；不同内容 409 [题面]
+        request_id = payload["request_id"]
+        fingerprint = self._fingerprint(path, payload)
+        if request_id in self._idempotency:
+            seen_fp, seen_status, seen_body = self._idempotency[request_id]
+            if seen_fp == fingerprint:
+                return seen_status, dict(seen_body)
+            return 409, self._reject(path)
+        # 6) 业务状态机
+        status, body = self._execute(path, payload)
+        if status == 200 and body.get("accepted") is True:
+            self._idempotency[request_id] = (fingerprint, status, dict(body))
+        return status, body
+
+    # ------------------------------------------------------------------ 动作
+    def _execute(self, path: str, payload: dict) -> tuple[int, dict]:
+        if path == "/enter":
+            if self.entered or self.exited:
+                return 200, self._not_accepted()
+            self.entered = True
+            return 200, self._ok({
+                "max_virtual_duration_s": self.field.max_virtual_duration_s,
+                "max_real_duration_s": self.field.max_real_duration_s,
+                "remaining_real_duration_s": self.field.max_real_duration_s,
+            })
+        if not self.entered or self.exited:
+            return 200, self._not_accepted()
+        if path == "/exit":
+            self.exited = True
+            return 200, self._ok({"exit_reason": EXIT_USER})
+        # /measure 与 /clear 共同的字段校验 -> 400 [题面]
+        position = payload.get("position")
+        if not isinstance(position, dict) or not set(POSITION_FIELDS) <= set(position):
+            return 400, self._reject(path)
+        for key in ("x", "y"):
+            value = position[key]
+            if isinstance(value, bool) or not isinstance(value, (int, float)) \
+                    or not isfinite(value) or abs(value) > self.field.coord_abs_limit_m:
+                return 400, self._reject(path)
+        channel = payload.get("channel")
+        if isinstance(channel, bool) or not isinstance(channel, (int, float)) \
+                or not float(channel).is_integer() \
+                or not self.field.channel_min <= channel <= self.field.channel_max:
+            return 400, self._reject(path)
+        channel = int(channel)
+        pos = (float(position["x"]), float(position["y"]))
+
+        if path == "/measure":
+            return self._measure(pos, channel)
+        return self._clear(pos, channel)
+
+    def _measure(self, pos, channel: int) -> tuple[int, dict]:
+        breakdown = measure_cost(self.position, pos, self.channel, channel, self.cost)
+        result, svd = self._observe(pos, channel)
+        self.position = pos
+        self.channel = channel          # 只有合法 /measure 更新频道 [题面]
+        self._advance(breakdown.total_s)
+        body = {"measure_result": result}
+        if result == DIRECTION:
+            body["svd_deg"] = svd
+        return 200, self._ok(body)
+
+    def _clear(self, pos, channel: int) -> tuple[int, dict]:
+        source = self._source(channel)
+        success = (source is not None and source.channel not in self.cleared
+                   and hypot(pos[0] - source.x, pos[1] - source.y)
+                   <= self.field.clear_radius_m)
+        breakdown = clear_cost(self.position, pos, success, self.cost)
+        self.position = pos             # /clear 不改变频道 [题面]
+        if success:
+            self.cleared.add(channel)
+        self._advance(breakdown.total_s)
+        result = CLEAR_SUCCESS if success else CLEAR_NO_TARGET
+        return 200, self._ok({"clear_result": result})
+
+    # ------------------------------------------------------------------ 观测
+    def _observe(self, pos, channel: int):
+        source = self._source(channel)
+        if source is None or channel in self.cleared:
+            return NO_SIGNAL, None
+        distance = hypot(pos[0] - source.x, pos[1] - source.y)
+        if distance > source.r_eff_m:
+            return NO_SIGNAL, None
+        if source.directional:
+            bearing_to_point = degrees(atan2(pos[1] - source.y, pos[0] - source.x))
+            if self._angular_gap(bearing_to_point, source.heading_deg) \
+                    > self.field.directional_half_angle_deg:
+                return NO_SIGNAL, None
+        if distance <= self.field.near_radius_m:
+            return NEAR, None
+        true_bearing = degrees(atan2(source.y - pos[1], source.x - pos[0]))
+        error = self._rng.uniform(-self.error_half_deg, self.error_half_deg)
+        svd = round(true_bearing + error, self.field.bearing_decimals) % 360.0
+        return DIRECTION, svd
+
+    def _source(self, channel: int):
+        for source in self.sources:
+            if source.channel == channel:
+                return source
+        return None
+
+    @staticmethod
+    def _angular_gap(a: float, b: float) -> float:
+        return abs((a - b + 180.0) % 360.0 - 180.0)
+
+    # ------------------------------------------------------------------ 计时与响应
+    def _advance(self, seconds: float) -> None:
+        self.virtual_time_s += seconds
+
+    def _ok(self, extra: dict) -> dict:
+        self._rtt_ms += 40.0
+        body = {"accepted": True,
+                "real_timestamp_ms": 1_760_000_000_000.0 + self._rtt_ms,
+                "virtual_time_s": self.virtual_time_s, **extra}
+        return body
+
+    def _not_accepted(self) -> dict:
+        return {"accepted": False, "real_timestamp_ms": 1_760_000_000_000.0,
+                "virtual_time_s": 0}   # accepted=false 时恒为 0 [题面]
+
+    def _reject(self, path: str) -> dict:
+        return {"accepted": False, "real_timestamp_ms": 1_760_000_000_000.0,
+                "virtual_time_s": 0, "detail": f"{path} 请求被拒绝"}
+
+    @staticmethod
+    def _fingerprint(path: str, payload) -> str:
+        canonical = json.dumps({"path": path, "payload": payload},
+                               sort_keys=True, ensure_ascii=False,
+                               separators=(",", ":"))
+        return hashlib.sha256(canonical.encode("utf-8")).hexdigest()
diff --git a/src/mcm26b/sim/transport.py b/src/mcm26b/sim/transport.py
new file mode 100644
index 0000000..326f081
--- /dev/null
+++ b/src/mcm26b/sim/transport.py
@@ -0,0 +1,53 @@
+"""测试侧传输：把 LocalSimulator 挂到 Transport 接口 + 故障注入脚本。
+
+故障脚本用于 P1 验收"失败重试不污染状态"：
+- ``"drop_before"``   连接失败，动作未送达服务器（可安全重试）；
+- ``"timeout_after"`` 服务器已受理并生效，但响应丢失（必须靠幂等回放）；
+- ``("status", n)``   服务器返回指定 HTTP 状态码（如 500/429）；
+- ``None``            正常放行。
+脚本耗尽后一律放行。
+"""
+
+from __future__ import annotations
+
+import json
+from urllib.parse import urlsplit
+
+from ..protocol.transport import Transport, TransportError, TransportResponse
+from .simulator import LocalSimulator
+
+
+class LocalSimTransport(Transport):
+    """内存回环：不经过网络栈的本地模拟器传输。"""
+
+    def __init__(self, simulator: LocalSimulator):
+        self.simulator = simulator
+        self.received: list[tuple[str, dict]] = []
+
+    def post(self, url, body, headers, timeout):
+        path = urlsplit(url).path
+        payload = json.loads(body.decode("utf-8"))
+        self.received.append((path, payload))
+        status, response = self.simulator.handle(path, payload)
+        return TransportResponse(status, json.dumps(response, ensure_ascii=False).encode("utf-8"))
+
+
+class ScriptedFaultTransport(Transport):
+    """按脚本注入故障后转发给内层传输。"""
+
+    def __init__(self, inner: Transport, script: list):
+        self.inner = inner
+        self.script = list(script)
+        self.sent_requests: list[bytes] = []
+
+    def post(self, url, body, headers, timeout):
+        self.sent_requests.append(body)
+        fault = self.script.pop(0) if self.script else None
+        if fault == "drop_before":
+            raise TransportError("injected: connection refused before send")
+        if fault == "timeout_after":
+            self.inner.post(url, body, headers, timeout)   # 服务器已受理
+            raise TransportError("injected: read timeout after server applied")
+        if isinstance(fault, tuple) and fault and fault[0] == "status":
+            return TransportResponse(int(fault[1]), b'{"accepted": false, "real_timestamp_ms": 0, "virtual_time_s": 0}')
+        return self.inner.post(url, body, headers, timeout)
diff --git a/src/visualization/question1.html b/src/visualization/question1.html
deleted file mode 100644
index d8627ec..0000000
--- a/src/visualization/question1.html
+++ /dev/null
@@ -1,185 +0,0 @@
-<div id="q1-localization">
-  <style>
-    #q1-localization .q1-plot { width:100%; display:block; overflow:hidden; }
-    #q1-localization .q1-legend { display:flex; flex-wrap:wrap; gap:12px; margin-block:12px; }
-    #q1-localization .q1-legend span { display:inline-flex; align-items:center; gap:6px; }
-    #q1-localization .q1-swatch { display:inline-block; width:18px; height:3px; }
-    #q1-localization .q1-stats { display:flex; flex-wrap:wrap; gap:12px 24px; margin-block:12px; }
-    #q1-localization .q1-status { margin-block:8px; }
-    #q1-localization .q1-plot text { fill:var(--foreground); font-size:12px; font-weight:400; }
-    #q1-localization details { margin-block:12px; }
-    #q1-localization summary { cursor:pointer; }
-  </style>
-  <h2>带误差的交会定位</h2>
-  <div class="viz-controls">
-    <label class="form-label">观测案例
-      <select class="form-select" data-q1="case" aria-label="观测案例"></select>
-    </label>
-    <label class="form-label">视图
-      <select class="form-select" data-q1="view" aria-label="视图">
-        <option value="region">定位区域放大</option>
-        <option value="global">检测点全景</option>
-      </select>
-    </label>
-    <label class="form-label">已加入测点 <span data-q1="step-label" class="tabular-nums"></span>
-      <input class="form-range" data-q1="step" type="range" min="1" max="3" value="3" step="1" aria-label="已加入测点数量">
-    </label>
-  </div>
-  <div class="q1-stats tabular-nums" aria-live="polite" data-q1="stats"></div>
-  <svg class="q1-plot" data-q1="plot" role="img" aria-label="检测角域、定位多边形、直径线段和两个包围圆"></svg>
-  <div class="q1-legend text-small">
-    <span><i class="q1-swatch" style="background:var(--viz-series-1)"></i>定位区域</span>
-    <span><i class="q1-swatch" style="background:var(--viz-series-2)"></i>直径线段及直径圆</span>
-    <span><i class="q1-swatch" style="background:var(--viz-series-3)"></i>最小包围圆</span>
-    <span>□ 检测点　＋ 合成真值　◎ 覆盖反例顶点</span>
-  </div>
-  <div class="q1-status text-small" data-q1="status" aria-live="polite"></div>
-  <details>
-    <summary>检测点与示向度</summary>
-    <div class="table-responsive">
-      <table class="table table-sm tabular-nums">
-        <thead><tr><th>测点</th><th class="text-end">x / m</th><th class="text-end">y / m</th><th class="text-end">示向度 / °</th><th class="text-end">误差半角 / °</th></tr></thead>
-        <tbody data-q1="rows"></tbody>
-      </table>
-    </div>
-  </details>
-  <script>
-  (() => {
-    const root=document.getElementById('q1-localization');
-    const cases=[{"id": "normal", "name": "三点交会", "source": "synthetic", "target": [80, 90], "measurements": [{"x": -600, "y": -250, "bearing_deg": 27.21505117707799, "half_angle_deg": 1.0}, {"x": 650, "y": -100, "bearing_deg": 161.015051177078, "half_angle_deg": 1.0}, {"x": 100, "y": 700, "bearing_deg": 268.4721225527146, "half_angle_deg": 1.0}], "frames": [{"status": "unbounded", "vertices": [[-600.0, -250.0]], "tolerance_m": 1e-09, "diameter_infinite": true, "diameter_m": null, "recession_direction": [0.8971423583981722, 0.44174154068614097], "message": "存在非零衰退方向，区域无界，直径为无穷大"}, {"status": "polygon", "vertices": [[45.3908396669742, 96.27384560337686], [80.26352724282751, 84.95314961314784], [106.24825816469405, 97.74770218809789], [71.61376404345356, 110.34332460542697]], "tolerance_m": 6.294839156007086e-07, "diameter_infinite": false, "diameter_m": 60.87526295170263, "diameter_pair": [[45.3908396669742, 96.27384560337686], [106.24825816469405, 97.74770218809789]], "area_m2": 778.9645078415749, "diameter_circle": {"center": [75.81954891583413, 97.01077389573737], "radius_m": 30.437631475851315, "max_vertex_distance_m": 30.43763147585132, "covers": true, "coverage_tolerance_m": 2.5179356624028345e-06, "max_excess_m": 4.367922104569409e-15, "outside_vertex_indices": [], "witness_vertex": null}, "minimum_enclosing_circle": {"center": [75.81954891583412, 97.01077389573737], "radius_m": 30.437631475851326}, "guaranteed_clearable_at_mec_center": false, "clearance_certificate": {"model": "angular_intersection_only", "clear_radius_m": 20.0, "numerical_margin_m": 2.5179356624028345e-06, "radius_with_margin_m": 30.437633993786985, "remaining_margin_m": -10.437633993786985, "center": [75.81954891583412, 97.01077389573737]}}, {"status": "polygon", "vertices": [[72.95144059951443, 87.32686714676511], [80.26352724282755, 84.95314961314779], [94.39740997503758, 91.91249455495989], [94.49056873706193, 102.02365367196415], [73.93038642999645, 109.5008321248877]], "tolerance_m": 7.462871059079371e-07, "diameter_infinite": false, "diameter_m": 26.986082918182134, "diameter_pair": [[94.39740997503758, 91.91249455495989], [73.93038642999645, 109.5008321248877]], "area_m2": 382.03705547378974, "diameter_circle": {"center": [84.163898202517, 100.7066633399238], "radius_m": 13.493041459091067, "max_vertex_distance_m": 17.45675089097608, "covers": false, "coverage_tolerance_m": 2.9851484236317485e-06, "max_excess_m": 3.96370943188501, "outside_vertex_indices": [0, 1], "witness_vertex": [72.95144059951443, 87.32686714676511]}, "minimum_enclosing_circle": {"center": [81.87363979249537, 98.04155797588491], "radius_m": 13.943107186092131}, "guaranteed_clearable_at_mec_center": true, "clearance_certificate": {"model": "angular_intersection_only", "clear_radius_m": 20.0, "numerical_margin_m": 2.9851484236317485e-06, "radius_with_margin_m": 13.943110171240557, "remaining_margin_m": 6.056889828759443, "center": [81.87363979249537, 98.04155797588491]}}]}, {"id": "triangle", "name": "直径圆反例", "source": "synthetic", "target": [20, 11.547005383792515], "measurements": [{"x": -1000, "y": 0, "bearing_deg": 1, "half_angle_deg": 1.0}, {"x": 540, "y": -866.0254037844386, "bearing_deg": 121, "half_angle_deg": 1.0}, {"x": 520, "y": 900.6664199358162, "bearing_deg": 241, "half_angle_deg": 1.0}], "frames": [{"status": "unbounded", "vertices": [[-1000.0, 0.0]], "tolerance_m": 1e-09, "diameter_infinite": true, "diameter_m": null, "recession_direction": [1.0, 0.0], "message": "存在非零衰退方向，区域无界，直径为无穷大"}, {"status": "polygon", "vertices": [[-22.483050583603557, 34.1356440648463], [-1.1527327997955013, 0.0], [40.000000000000284, 0.0], [19.44641513032613, 35.59985327195466]], "tolerance_m": 8.83402513014311e-07, "diameter_infinite": false, "diameter_m": 71.19953515266143, "diameter_pair": [[-22.483050583603557, 34.1356440648463], [40.000000000000284, 0.0]], "area_m2": 1463.776307271084, "diameter_circle": {"center": [8.75847470819835, 17.06782203242318], "radius_m": 35.59976757633071, "max_vertex_distance_m": 35.59976757633074, "covers": true, "coverage_tolerance_m": 3.533610052057244e-06, "max_excess_m": 2.4519345249005315e-14, "outside_vertex_indices": [], "witness_vertex": null}, "minimum_enclosing_circle": {"center": [8.75847470819835, 17.06782203242318], "radius_m": 35.59976757633074}, "guaranteed_clearable_at_mec_center": false, "clearance_certificate": {"model": "angular_intersection_only", "clear_radius_m": 20.0, "numerical_margin_m": 3.533610052057244e-06, "radius_with_margin_m": 35.59977110994079, "remaining_margin_m": -15.59977110994079, "center": [8.75847470819835, 17.06782203242318]}}, {"status": "polygon", "vertices": [[-5.755396159656812e-13, 0.0], [40.000000000000234, 0.0], [19.999999999999847, 34.64101615137823]], "tolerance_m": 1.0200653573832087e-06, "diameter_infinite": false, "diameter_m": 40.00000000000081, "diameter_pair": [[-5.755396159656812e-13, 0.0], [40.000000000000234, 0.0]], "area_m2": 692.8203230275786, "diameter_circle": {"center": [19.99999999999983, 0.0], "radius_m": 20.000000000000405, "max_vertex_distance_m": 34.641016151378224, "covers": false, "coverage_tolerance_m": 4.080261429532835e-06, "max_excess_m": 14.641016151377823, "outside_vertex_indices": [2], "witness_vertex": [19.999999999999847, 34.64101615137823]}, "minimum_enclosing_circle": {"center": [19.99999999999983, 11.547005383792735], "radius_m": 23.094010767585495}, "guaranteed_clearable_at_mec_center": false, "clearance_certificate": {"model": "angular_intersection_only", "clear_radius_m": 20.0, "numerical_margin_m": 4.080261429532835e-06, "radius_with_margin_m": 23.094014847846925, "remaining_margin_m": -3.0940148478469247, "center": [19.99999999999983, 11.547005383792735]}}]}, {"id": "poor", "name": "近共线检测点", "source": "synthetic", "target": [900, 50], "measurements": [{"x": 0, "y": 0, "bearing_deg": 3.1798301198642345, "half_angle_deg": 1.0}, {"x": 100, "y": 0, "bearing_deg": 3.576334374997351, "half_angle_deg": 1.0}, {"x": 200, "y": 0, "bearing_deg": 4.085616779974877, "half_angle_deg": 1.0}], "frames": [{"status": "unbounded", "vertices": [[0.0, 0.0]], "tolerance_m": 1e-09, "diameter_infinite": true, "diameter_m": null, "recession_direction": [0.9992763681850043, 0.03803603537420482], "message": "存在非零衰退方向，区域无界，直径为无穷大"}, {"status": "unbounded", "vertices": [[190.67332308426802, 7.257709171010532], [649.0783141257873, 24.706243940862326], [1149.8860918066787, 84.03538833511422]], "tolerance_m": 5.0000000000000004e-08, "diameter_infinite": true, "diameter_m": null, "recession_direction": [0.9973401975299315, 0.07288710716551386], "message": "存在非零衰退方向，区域无界，直径为无穷大"}, {"status": "unbounded", "vertices": [[349.47112173238565, 13.302121787008087], [649.0783141257873, 24.706243940862326], [704.9784261478786, 27.221516841665565], [1149.886091806679, 84.03538833511422], [1094.1078143807658, 79.57076189541714]], "tolerance_m": 1.0000000000000001e-07, "diameter_infinite": true, "diameter_m": null, "recession_direction": [0.9973401975299315, 0.07288710716551386], "message": "存在非零衰退方向，区域无界，直径为无穷大"}]}, {"id": "empty", "name": "不相容观测", "source": "synthetic", "target": null, "measurements": [{"x": -100, "y": 0, "bearing_deg": 180, "half_angle_deg": 1.0}, {"x": 100, "y": 0, "bearing_deg": 0, "half_angle_deg": 1.0}], "frames": [{"status": "unbounded", "vertices": [[-100.0, 0.0]], "tolerance_m": 1e-09, "diameter_infinite": true, "diameter_m": null, "recession_direction": [-0.9998476951563913, 0.01745240643728344], "message": "存在非零衰退方向，区域无界，直径为无穷大"}, {"status": "empty", "vertices": [], "diameter_m": null, "diameter_infinite": false, "tolerance_m": 1.0000000000000001e-07, "message": "测向角域没有公共点；检查频道、数据及误差界"}]}, {"id": "segment", "name": "零误差退化线段", "source": "synthetic", "target": [40, 0], "measurements": [{"x": 0, "y": 0, "bearing_deg": 0, "half_angle_deg": 0}, {"x": 100, "y": 0, "bearing_deg": 180, "half_angle_deg": 0}], "frames": [{"status": "unbounded", "vertices": [[0.0, 0.0]], "tolerance_m": 1e-09, "diameter_infinite": true, "diameter_m": null, "recession_direction": [1.0, 0.0], "message": "存在非零衰退方向，区域无界，直径为无穷大"}, {"status": "segment", "vertices": [[0.0, 0.0], [100.0, 0.0]], "tolerance_m": 5.0000000000000004e-08, "diameter_infinite": false, "diameter_m": 100.0, "diameter_pair": [[0.0, 0.0], [100.0, 0.0]], "area_m2": 0.0, "diameter_circle": {"center": [50.0, 0.0], "radius_m": 50.0, "max_vertex_distance_m": 50.0, "covers": true, "coverage_tolerance_m": 2.0000000000000002e-07, "max_excess_m": 0.0, "outside_vertex_indices": [], "witness_vertex": null}, "minimum_enclosing_circle": {"center": [50.0, 0.0], "radius_m": 50.0}, "guaranteed_clearable_at_mec_center": false, "clearance_certificate": {"model": "angular_intersection_only", "clear_radius_m": 20.0, "numerical_margin_m": 2.0000000000000002e-07, "radius_with_margin_m": 50.0000002, "remaining_margin_m": -30.000000200000002, "center": [50.0, 0.0]}}]}, {"id": "practice-U5ZW-P9KN-TCAG-R7ST", "name": "官方演练 U5ZW-P9KN-TCAG-R7ST", "source": "official_practice", "target": null, "measurements": [{"x": 0, "y": 0, "bearing_deg": 131.52, "half_angle_deg": 1.0}, {"x": -613.7618853216438, "y": 391.53077545248124, "bearing_deg": 34.92, "half_angle_deg": 1.0}, {"x": -314.2721344680094, "y": 656.6833525352392, "bearing_deg": 227.19, "half_angle_deg": 1.0}], "frames": [{"status": "unbounded", "vertices": [[0.0, 0.0]], "tolerance_m": 1e-09, "diameter_infinite": true, "diameter_m": null, "recession_direction": [-0.6497134405131868, 0.7601792191427741], "message": "存在非零衰退方向，区域无界，直径为无穷大"}, {"status": "polygon", "vertices": [[-460.69830582516533, 502.4117755118043], [-456.18958970820563, 497.4948221803977], [-436.511353451526, 510.7280211898303], [-441.37035594940073, 516.4131625064848]], "tolerance_m": 3.6400549446402593e-07, "diameter_infinite": false, "diameter_m": 25.57672002626576, "diameter_pair": [[-460.69830582516533, 502.4117755118043], [-436.511353451526, 510.7280211898303]], "area_m2": 167.16830387852585, "diameter_circle": {"center": [-448.6048296383457, 506.5698983508173], "radius_m": 12.78836001313288, "max_vertex_distance_m": 12.788360013132888, "covers": true, "coverage_tolerance_m": 1.4560219778561037e-06, "max_excess_m": 7.577386519575496e-15, "outside_vertex_indices": [], "witness_vertex": null}, "minimum_enclosing_circle": {"center": [-448.6048296383457, 506.5698983508173], "radius_m": 12.788360013132888}, "guaranteed_clearable_at_mec_center": true, "clearance_certificate": {"model": "angular_intersection_only", "clear_radius_m": 20.0, "numerical_margin_m": 1.4560219778561037e-06, "radius_with_margin_m": 12.788361469154864, "remaining_margin_m": 7.211638530845136, "center": [-448.6048296383457, 506.5698983508173]}}, {"status": "polygon", "vertices": [[-460.69830582516533, 502.41177551180425], [-456.4242356873799, 497.75071394627366], [-440.56989343525083, 515.4766035082919], [-441.3703559494006, 516.4131625064849]], "tolerance_m": 4.666666666666667e-07, "diameter_infinite": false, "diameter_m": 23.996723024535473, "diameter_pair": [[-460.69830582516533, 502.41177551180425], [-440.56989343525083, 515.4766035082919]], "area_m2": 89.48455568449387, "diameter_circle": {"center": [-450.6340996302081, 508.9441895100481], "radius_m": 11.998361512267737, "max_vertex_distance_m": 12.60236369723464, "covers": false, "coverage_tolerance_m": 1.8666666666666669e-06, "max_excess_m": 0.604002184966904, "outside_vertex_indices": [1], "witness_vertex": [-456.4242356873799, 497.75071394627366]}, "minimum_enclosing_circle": {"center": [-449.97695530423994, 507.9528348831342], "radius_m": 12.068583013309823}, "guaranteed_clearable_at_mec_center": true, "clearance_certificate": {"model": "angular_intersection_only", "clear_radius_m": 20.0, "numerical_margin_m": 1.8666666666666669e-06, "radius_with_margin_m": 12.068584879976491, "remaining_margin_m": 7.931415120023509, "center": [-449.97695530423994, 507.9528348831342]}}]}];
-    const get=name=>root.querySelector('[data-q1="'+name+'"]');
-    const picker=get('case'), step=get('step'), view=get('view'), svg=get('plot');
-    const NS='http://www.w3.org/2000/svg';
-    const fmt=x=>Number.isFinite(x)?x.toLocaleString('zh-CN',{maximumFractionDigits:4}):'—';
-    const names={polygon:'有界多边形',segment:'线段',point:'单点',empty:'空集',unbounded:'无界区域'};
-    function node(tag,attrs={},parent=svg,text=null) {
-      const el=document.createElementNS(NS,tag);
-      Object.entries(attrs).forEach(([k,v])=>el.setAttribute(k,String(v)));
-      if(text!==null)el.textContent=text;
-      parent.appendChild(el);return el;
-    }
-    cases.forEach((c,i)=>picker.add(new Option(c.name,i)));
-    picker.value=String(Math.max(0,cases.findIndex(c=>c.source==='official_practice')));
-
-    function load() {
-      const c=cases[+picker.value];
-      step.max=String(c.measurements.length);step.value=step.max;draw();
-    }
-    function draw() {
-      const c=cases[+picker.value], n=+step.value, ms=c.measurements.slice(0,n), r=c.frames[n-1];
-      get('step-label').textContent=n+' / '+c.measurements.length;
-      get('stats').replaceChildren();
-      const values=[['区域',names[r.status]],['直径 D',r.diameter_infinite?'∞':fmt(r.diameter_m)+' m'],
-                    ['最小包围半径',r.minimum_enclosing_circle?fmt(r.minimum_enclosing_circle.radius_m)+' m':'—']];
-      values.forEach(([label,value])=>{const span=document.createElement('span');span.textContent=label+'：'+value;get('stats').appendChild(span);});
-      const source=c.source==='official_practice'?'官方演练观测；真实源位置未公开':'本地合成案例';
-      get('status').textContent=source+' · '+(r.status==='unbounded'?'阴影只显示视窗内部分，真实区域无界':
-        r.status==='empty'?'这些观测在给定误差界下不相容':
-        '直径圆'+(r.diameter_circle.covers?'可以覆盖':'不能覆盖，最大超出 '+fmt(r.diameter_circle.max_excess_m)+' m')+
-        ' · 清除半径余量 '+fmt(r.clearance_certificate.remaining_margin_m)+' m');
-      get('rows').replaceChildren();
-      ms.forEach((m,i)=>{
-        const tr=document.createElement('tr');
-        [String(i+1),fmt(m.x),fmt(m.y),fmt(m.bearing_deg),fmt(m.half_angle_deg)].forEach((v,j)=>{
-          const td=document.createElement('td');td.textContent=v;if(j)td.className='text-end';tr.appendChild(td);
-        });get('rows').appendChild(tr);
-      });
-      svg.replaceChildren();
-      const width=Math.max(280,root.getBoundingClientRect().width);
-      const height=Math.max(310,Math.min(440,width*.65));
-      svg.setAttribute('viewBox',`0 0 ${width} ${height}`);
-      svg.style.height=height+'px';
-      node('title',{},svg,c.name+'：'+names[r.status]);
-      node('desc',{},svg,get('status').textContent);
-      const l=64,t=20,right=20,bottom=46,w=width-l-right,h=height-t-bottom;
-      const finite=['polygon','segment','point'].includes(r.status);
-      let pts=(view.value==='region'&&finite)?r.vertices.map(p=>[...p]):ms.map(m=>[m.x,m.y]);
-      if(!pts.length)pts=[[0,0]];
-      if(view.value==='global'&&finite)pts.push(...r.vertices);
-      if(c.target)pts.push(c.target);
-      if(finite&&view.value==='region') {
-        [r.diameter_circle,r.minimum_enclosing_circle].forEach(circle=>{
-          const [x,y]=circle.center,d=circle.radius_m;
-          pts.push([x-d,y-d],[x+d,y+d]);
-        });
-      }
-      const xs=pts.map(p=>p[0]),ys=pts.map(p=>p[1]);
-      const cx=(Math.min(...xs)+Math.max(...xs))/2, cy=(Math.min(...ys)+Math.max(...ys))/2;
-      let dx=Math.max(...xs)-Math.min(...xs),dy=Math.max(...ys)-Math.min(...ys);
-      const minSpan=finite&&view.value==='region'?Math.max(2,(r.diameter_m||0)*.08):200;
-      const scale=Math.min(w/Math.max(dx*1.3,minSpan),h/Math.max(dy*1.3,minSpan));
-      const xmin=cx-w/(2*scale),xmax=cx+w/(2*scale),ymin=cy-h/(2*scale),ymax=cy+h/(2*scale);
-      const X=x=>l+(x-xmin)*scale,Y=y=>t+h-(y-ymin)*scale;
-      const defs=node('defs');const clip=node('clipPath',{id:'q1-clip'},defs);
-      node('rect',{x:l,y:t,width:w,height:h},clip);
-      for(let i=0;i<4;i++) {
-        const x=xmin+(xmax-xmin)*i/3, y=ymin+(ymax-ymin)*i/3;
-        node('line',{x1:X(x),x2:X(x),y1:t,y2:t+h,stroke:'var(--border)'});
-        node('line',{x1:l,x2:l+w,y1:Y(y),y2:Y(y),stroke:'var(--border)'});
-        const tick=z=>Math.abs(z)>=1e6?z.toExponential(1):Math.abs(xmax-xmin)<20?z.toFixed(1):Math.round(z).toString();
-        node('text',{x:X(x),y:t+h+19,'text-anchor':i===0?'start':i===3?'end':'middle'},svg,tick(x));
-        node('text',{x:l-8,y:Y(y)+4,'text-anchor':'end'},svg,tick(y));
-      }
-      node('text',{x:l+w/2,y:height-7,'text-anchor':'middle',class:'axis-title','data-axis':'x'},svg,'x / m');
-      node('text',{x:14,y:t+h/2,'text-anchor':'middle',transform:`rotate(-90 14 ${t+h/2})`,class:'axis-title','data-axis':'y'},svg,'y / m');
-      const layer=node('g',{'clip-path':'url(#q1-clip)'});
-      let displayPoly;
-      if(finite)displayPoly=r.vertices;
-      else if(r.status==='empty')displayPoly=[];
-      else {
-        // Display clipping ONLY: Python's result remains explicitly unbounded.
-        displayPoly=[[xmin,ymin],[xmax,ymin],[xmax,ymax],[xmin,ymax]];
-        ms.forEach(m=>{
-          const theta=m.bearing_deg*Math.PI/180,d=m.half_angle_deg*Math.PI/180;
-          const normals=[[Math.sin(theta-d),-Math.cos(theta-d)],[-Math.sin(theta+d),Math.cos(theta+d)],[-Math.cos(theta),-Math.sin(theta)]];
-          normals.forEach(([a,b])=>{
-            const bound=a*m.x+b*m.y,out=[];
-            for(let i=0;i<displayPoly.length;i++) {
-              const p=displayPoly[i],q=displayPoly[(i+1)%displayPoly.length];
-              const f=a*p[0]+b*p[1]-bound,g=a*q[0]+b*q[1]-bound;
-              if(f<=1e-8)out.push(p);
-              if((f<0&&g>0)||(f>0&&g<0))out.push([p[0]+(q[0]-p[0])*f/(f-g),p[1]+(q[1]-p[1])*f/(f-g)]);
-            }displayPoly=out;
-          });
-        });
-      }
-      if(displayPoly.length>=3)node('polygon',{points:displayPoly.map(p=>X(p[0])+','+Y(p[1])).join(' '),fill:'var(--viz-series-1)','fill-opacity':.18,stroke:'var(--viz-series-1)','stroke-width':1.5},layer);
-      const reach=Math.hypot(xmax-xmin,ymax-ymin)+Math.max(...ms.map(m=>Math.hypot(m.x-cx,m.y-cy)))*2;
-      ms.forEach((m,i)=>{
-        [-m.half_angle_deg,0,m.half_angle_deg].forEach(offset=>{
-          const a=(m.bearing_deg+offset)*Math.PI/180;
-          node('line',{x1:X(m.x),y1:Y(m.y),x2:X(m.x+reach*Math.cos(a)),y2:Y(m.y+reach*Math.sin(a)),
-            stroke:'var(--foreground)','stroke-opacity':offset===0?.35:.22,'stroke-width':1,'stroke-dasharray':offset===0?'none':'4 4'},layer);
-        });
-        if(m.x>=xmin&&m.x<=xmax&&m.y>=ymin&&m.y<=ymax) {
-          node('rect',{x:X(m.x)-4,y:Y(m.y)-4,width:8,height:8,fill:'var(--foreground)'},layer);
-          node('text',{x:Math.min(l+w-22,X(m.x)+9),y:Math.max(t+14,Y(m.y)-9)},layer,'S'+(i+1));
-        }
-      });
-      if(finite) {
-        [r.diameter_circle,r.minimum_enclosing_circle].forEach((circle,i)=>{
-          node('circle',{cx:X(circle.center[0]),cy:Y(circle.center[1]),r:circle.radius_m*scale,
-            fill:'none',stroke:`var(--viz-series-${i+2})`,'stroke-width':2,'stroke-dasharray':i===0?'6 4':'none'},layer);
-        });
-        const [a,b]=r.diameter_pair;
-        node('line',{x1:X(a[0]),y1:Y(a[1]),x2:X(b[0]),y2:Y(b[1]),stroke:'var(--viz-series-2)','stroke-width':2.5},layer);
-        r.vertices.forEach((p,i)=>{
-          const mark=node('circle',{cx:X(p[0]),cy:Y(p[1]),r:4,fill:'var(--viz-series-1)'},layer);
-          node('title',{},mark,`V${i+1} (${fmt(p[0])}, ${fmt(p[1])})`);
-        });
-        const witness=r.diameter_circle.witness_vertex;
-        if(witness)node('circle',{cx:X(witness[0]),cy:Y(witness[1]),r:8,
-          fill:'none',stroke:'var(--viz-series-2)','stroke-width':2},layer);
-      }
-      if(c.target&&c.target[0]>=xmin&&c.target[0]<=xmax&&c.target[1]>=ymin&&c.target[1]<=ymax) {
-        const x=X(c.target[0]),y=Y(c.target[1]);
-        node('path',{d:`M${x-5},${y}h10 M${x},${y-5}v10`,stroke:'var(--foreground)','stroke-width':2},layer);
-      }
-      node('rect',{x:l,y:t,width:w,height:h,fill:'none',stroke:'var(--border)','data-chart-frame':''});
-    }
-    picker.addEventListener('change',load);step.addEventListener('input',draw);view.addEventListener('change',draw);
-    new ResizeObserver(draw).observe(root);
-    load();
-  })();
-  </script>
-</div>
diff --git a/src/tests/test_geometry.py b/tests/test_geometry.py
similarity index 97%
rename from src/tests/test_geometry.py
rename to tests/test_geometry.py
index c39c08b..9ae70bf 100644
--- a/src/tests/test_geometry.py
+++ b/tests/test_geometry.py
@@ -2,8 +2,8 @@ import math
 import random
 import unittest
 
-from geometry import Measurement, solve, smallest_enclosing_circle
-from geometry.localization import halfplanes, distance
+from mcm26b.geometry import Measurement, solve, smallest_enclosing_circle
+from mcm26b.geometry.localization import halfplanes, distance
 
 
 class GeometryTests(unittest.TestCase):
diff --git a/src/tests/test_geometry_certificates.py b/tests/test_geometry_certificates.py
similarity index 94%
rename from src/tests/test_geometry_certificates.py
rename to tests/test_geometry_certificates.py
index 30b10a4..346024c 100644
--- a/src/tests/test_geometry_certificates.py
+++ b/tests/test_geometry_certificates.py
@@ -6,8 +6,9 @@ import subprocess
 import sys
 import unittest
 
-from geometry import Measurement, solve, smallest_enclosing_circle, first_bearing_candidate_disk
-from geometry.localization import _enclosing_circle_reference, distance
+from mcm26b.geometry import (Measurement, solve, smallest_enclosing_circle,
+                             first_bearing_candidate_disk)
+from mcm26b.geometry.localization import _enclosing_circle_reference, distance
 
 ROOT = Path(__file__).resolve().parents[1]
 
@@ -93,7 +94,7 @@ class CertificateTests(unittest.TestCase):
             first_bearing_candidate_disk(Measurement(0, 0, 0, 46))
 
     def test_cli_explicit_rounding_margin(self):
-        base = [sys.executable, '-m', 'geometry', 'examples/q1/triangle.json']
+        base = [sys.executable, '-m', 'mcm26b.geometry', 'examples/q1/triangle.json']
         outputs = [json.loads(subprocess.check_output(base+args, cwd=ROOT, encoding='utf-8'))
                    for args in [[], ['--rounding-margin-deg', '0.005']]]
         self.assertEqual(outputs[0]['error_policy']['effective_half_angles_deg'], [1, 1, 1])
diff --git a/src/tests/test_practice_replay.py b/tests/test_practice_replay.py
similarity index 97%
rename from src/tests/test_practice_replay.py
rename to tests/test_practice_replay.py
index 95e984a..e17a260 100644
--- a/src/tests/test_practice_replay.py
+++ b/tests/test_practice_replay.py
@@ -4,7 +4,7 @@ import json
 import math
 from pathlib import Path
 import unittest
-from geometry import Measurement, solve
+from mcm26b.geometry import Measurement, solve
 
 ROOT=Path(__file__).resolve().parents[1]
 
diff --git a/tests/test_protocol_client.py b/tests/test_protocol_client.py
new file mode 100644
index 0000000..90e4a91
--- /dev/null
+++ b/tests/test_protocol_client.py
@@ -0,0 +1,253 @@
+"""P1 验收测试：幂等重试、故障恢复、现实预算与真实演练日志回放。
+
+对应验收标准（docs/B题建模分析与实施计划.md P1 行）：
+- accepted=false 和超时重试不污染状态；
+- 失败重试复用原 request_id 与原内容，服务器端动作恰好生效一次；
+- 用 /enter 的 remaining_real_duration_s 建立本地截止时钟；
+- 官方演练日志可完整回放，本地重建状态与服务器记录逐步吻合。
+"""
+
+import json
+import math
+import tempfile
+import unittest
+from dataclasses import replace
+from pathlib import Path
+
+from mcm26b.config import ProblemConfig
+from mcm26b.evaluation import recompute_virtual_time, summarize
+from mcm26b.protocol.client import (DeadlineExceeded, ProtocolError,
+                                    SimulatorClient)
+from mcm26b.protocol.log import SessionLog
+from mcm26b.protocol.transport import TransportError
+from mcm26b.sim import (LocalSimTransport, LocalSimulator,
+                        PlaybackTransport, ScriptedFaultTransport, Source)
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+class FaultRecoveryTests(unittest.TestCase):
+    """故障注入：失败重试不污染状态、不重复生效。"""
+
+    def _client(self, script, sources=None):
+        simulator = LocalSimulator(sources or [], robot_id="T001")
+        inner = LocalSimTransport(simulator)
+        faults = ScriptedFaultTransport(inner, script)
+        client = SimulatorClient("T001", transport=faults)
+        return client, faults, simulator
+
+    def test_timeout_after_apply_replays_cached_response(self):
+        """读超时（服务器已生效）后重试：同一响应回放，动作不二次生效。"""
+        # 脚本按请求顺序消耗：enter 放行，measure 第一次注入"已生效但超时"。
+        client, faults, simulator = self._client([None, "timeout_after", None, None])
+        client.enter()
+        outcome = client.measure((0, 0), 1)
+        self.assertEqual(outcome.virtual_time_s, 5.0)
+        # measure 只被服务器执行了一次：请求发出两次，但虚拟时刻只推进一次。
+        measure_bodies = [body for body in faults.sent_requests[1:]]
+        self.assertEqual(len(measure_bodies), 2, "应发出原始请求+一次重试")
+        first, retry = (json.loads(b) for b in measure_bodies)
+        self.assertEqual(first["request_id"], retry["request_id"],
+                         "重试必须复用原 request_id")
+        self.assertEqual(first, retry, "重试请求体必须逐字段一致")
+        self.assertEqual(simulator.virtual_time_s, 5.0, "动作只生效一次")
+        self.assertEqual(client.state.virtual_time_s, 5.0)
+
+    def test_drop_before_apply_is_safe_to_retry(self):
+        """连接失败（未送达）后重试成功，无残留效果。"""
+        client, faults, simulator = self._client(["drop_before", None])
+        client.enter()
+        client.measure((100, 0), 1)
+        self.assertEqual(simulator.virtual_time_s, 25.0)  # 100/5 移动 + 5 检测
+        self.assertEqual(client.state.virtual_time_s, 25.0)
+
+    def test_server_500_retried_with_same_id(self):
+        client, faults, simulator = self._client([None, ("status", 500), None, None])
+        client.enter()
+        client.measure((0, 0), 1)
+        self.assertEqual(client.state.virtual_time_s, 5.0)
+
+    def test_exhausted_retries_raise_and_leave_state_clean(self):
+        # enter 放行后，measure 连续注入断连直至超过 max_attempts=3。
+        client, faults, simulator = self._client([None, "drop_before", "drop_before",
+                                                  "drop_before"])
+        client.enter()
+        with self.assertRaises(TransportError):
+            client.measure((0, 0), 1)
+        self.assertEqual(client.state.virtual_time_s, 0.0,
+                         "失败动作不得污染本地状态")
+        self.assertTrue(simulator.entered)     # enter 已成功，会话仍然有效
+        # 后续新动作用新 request_id 正常执行（脚本已耗尽，全部放行）。
+        outcome = client.measure((0, 0), 1)
+        self.assertEqual(outcome.virtual_time_s, 5.0)
+
+    def test_accepted_false_raises_and_state_untouched(self):
+        client, faults, simulator = self._client([None])
+        with self.assertRaises(ProtocolError) as ctx:
+            client.measure((0, 0), 1)          # 未 enter -> accepted=false
+        self.assertEqual(ctx.exception.status, 200)
+        self.assertEqual(client.state.virtual_time_s, 0.0)
+
+
+class DeadlineBudgetTests(unittest.TestCase):
+    """现实预算：本地单调时钟、预留余量、/exit 豁免。"""
+
+    def test_deadline_from_enter_remaining(self):
+        now = [1000.0]
+        simulator = LocalSimulator([], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator),
+                                 clock=lambda: now[0])
+        client.enter()
+        self.assertAlmostEqual(client.real_remaining_s, 1200.0)
+        now[0] += 300.0
+        self.assertAlmostEqual(client.real_remaining_s, 900.0)
+
+    def test_action_blocked_when_reserve_margin_cannot_be_kept(self):
+        now = [0.0]
+        simulator = LocalSimulator([], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator),
+                                 clock=lambda: now[0])
+        client.enter()                          # remaining = 1200s
+        now[0] += 1145.0                        # 只剩 55s < 60s 预留
+        with self.assertRaises(DeadlineExceeded):
+            client.measure((0, 0), 1)
+        info = client.exit()                    # /exit 不受预算拦截
+        self.assertEqual(info.reason, "user_exit")
+
+    def test_custom_reserve_margin(self):
+        now = [0.0]
+        simulator = LocalSimulator([], robot_id="T001")
+        config = replace(ProblemConfig(),
+                         session=replace(ProblemConfig().session,
+                                         reserve_exit_s=10.0))
+        client = SimulatorClient("T001", config=config,
+                                 transport=LocalSimTransport(simulator),
+                                 clock=lambda: now[0])
+        client.enter()
+        now[0] += 1195.0                        # 剩 5s < 新预留 10s
+        with self.assertRaises(DeadlineExceeded):
+            client.measure((0, 0), 1)
+
+
+class PracticeReplayTests(unittest.TestCase):
+    """官方演练日志经 PlaybackTransport 驱动完整客户端。"""
+
+    def _events(self):
+        files = sorted((ROOT / "output" / "q1" / "practice").glob("*_actions.json"))
+        self.assertTrue(files, "缺少演练采集证据")
+        events = []
+        for path in files:
+            events.extend(json.loads(path.read_text(encoding="utf-8")))
+        return events
+
+    def test_client_state_matches_recorded_server_clock(self):
+        events = self._events()
+        client = SimulatorClient("任意队号", transport=PlaybackTransport(events))
+        for event in events:
+            path, request = event["path"], event["request"]
+            if path == "/enter":
+                client.enter()
+            elif path == "/measure":
+                client.measure((request["position"]["x"], request["position"]["y"]),
+                               request["channel"])
+            elif path == "/exit":
+                client.exit()
+            self.assertAlmostEqual(
+                client.state.virtual_time_s,
+                event["response"]["virtual_time_s"], places=5,
+                msg=f"{path} 后本地虚拟时刻应与服务器记录一致")
+        self.assertTrue(client.state.exited)
+
+    def test_evaluation_recompute_agrees_with_recording(self):
+        events = [dict(path=e["path"], request=e["request"], response=e["response"])
+                  for e in self._events()
+                  if e["response"].get("accepted") is True]
+        report = recompute_virtual_time(events)
+        self.assertEqual(report["mismatches"], [])
+        self.assertAlmostEqual(report["final_virtual_time_s"],
+                               events[-1]["response"]["virtual_time_s"], places=5)
+
+    def test_summarize_counts(self):
+        events = [dict(path=e["path"], request=e["request"], response=e["response"])
+                  for e in self._events()]
+        stats = summarize(events)
+        directions = [e for e in events
+                      if e["response"].get("measure_result") == "direction"]
+        self.assertGreater(stats["measures"], 0)
+        self.assertEqual(stats["clears"], 0, "该次演练只采集观测，未调用 /clear")
+
+
+class LocalSimObservationTests(unittest.TestCase):
+    """观测语义：no_signal / near / direction 与定向覆盖角。"""
+
+    def test_distance_and_coverage_gate(self):
+        source = Source(channel=1, x=500, y=0, r_eff_m=1000)
+        simulator = LocalSimulator([source], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+        client.enter()
+        self.assertEqual(client.measure((1505, 0), 1).result, "no_signal")  # 距源1005>1000
+        self.assertEqual(client.measure((500, 998), 1).result, "direction")  # 1000内
+        self.assertEqual(client.measure((500, 0), 1).result, "near")         # <=5m
+
+    def test_directional_source_backside_invisible(self):
+        source = Source(channel=1, x=500, y=0, r_eff_m=1500,
+                        directional=True, heading_deg=90.0)  # 朝北
+        simulator = LocalSimulator([source], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+        client.enter()
+        self.assertEqual(client.measure((500, 600), 1).result, "direction")  # 正北
+        self.assertEqual(client.measure((500, -300), 1).result, "no_signal")  # 正南背面
+        self.assertEqual(client.measure((500, 998), 1).result, "direction")   # 边界含90度
+
+    def test_clear_ignores_directional_facing(self):
+        """清除只看距离：定向源背面同样可清除 [题面]。"""
+        source = Source(channel=7, x=0, y=0, r_eff_m=1500,
+                        directional=True, heading_deg=180.0)
+        simulator = LocalSimulator([source], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+        client.enter()
+        self.assertEqual(client.state.channel, 1)
+        outcome = client.clear((15, 0), 7)      # 距离15m<=20，位于背面
+        self.assertEqual(outcome.result, "success")
+        outcome = client.clear((0, 0), 7)       # 同源只能清除一次
+        self.assertEqual(outcome.result, "no_target_in_range")
+        # 两次 /clear 后测向机频道仍是初始 1：/clear 不切换频道 [题面]。
+        self.assertEqual(client.state.channel, 1)
+        # 清除后同频道无信号；/measure 会把频道更新为 7。
+        self.assertEqual(client.measure((100, 0), 7).result, "no_signal")
+        self.assertEqual(client.state.channel, 7)
+
+    def test_bearing_error_within_bound(self):
+        source = Source(channel=1, x=1000, y=300, r_eff_m=1500)
+        simulator = LocalSimulator([source], error_half_deg=1.0, robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+        client.enter()
+        outcome = client.measure((0, 0), 1)
+        true_bearing = math.degrees(math.atan2(300, 1000))
+        # 误差在 ±1° 内均匀分布，返回值再保留两位小数。
+        self.assertLessEqual(abs(outcome.svd_deg - true_bearing), 1.005)
+
+
+class SessionLogTests(unittest.TestCase):
+    def test_log_records_attempts_and_accepted(self):
+        with tempfile.TemporaryDirectory() as folder:
+            path = Path(folder) / "session.jsonl"
+            simulator = LocalSimulator([], robot_id="T001")
+            faults = ScriptedFaultTransport(LocalSimTransport(simulator),
+                                            [None, "drop_before", None, None])
+            client = SimulatorClient("T001", transport=faults,
+                                     log=SessionLog(path=path))
+            client.enter()
+            client.measure((0, 0), 1)
+            client.exit()
+            rows = [json.loads(line) for line in
+                    path.read_text(encoding="utf-8").splitlines()]
+            accepted = [row for row in rows if row["event"] == "accepted"]
+            self.assertEqual(len(accepted), 3)
+            self.assertEqual(accepted[1]["attempts"], 2, "重试后成功应记录尝试次数")
+            self.assertEqual(len({row["request_id"] for row in accepted}), 3,
+                             "每个被接受动作各占一个 request_id")
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tests/test_protocol_timing.py b/tests/test_protocol_timing.py
new file mode 100644
index 0000000..2756e39
--- /dev/null
+++ b/tests/test_protocol_timing.py
@@ -0,0 +1,207 @@
+"""P0 验收测试：计时示例、状态机规则与字段表语义。
+
+对应验收标准（docs/B题建模分析与实施计划.md P0 行）：
+- 附件计时示例能逐步得到 105、111、194、199 秒；
+- /clear 不切换测向频道；
+- accepted=false 不更新状态，其 virtual_time_s=0 不当作当前虚拟时刻。
+"""
+
+import unittest
+
+from mcm26b.config import CostConfig
+from mcm26b.protocol.rules import CLEAR_NO_TARGET
+from mcm26b.protocol.state import RobotState, StateError
+from mcm26b.protocol.timing import clear_cost, measure_cost
+from mcm26b.sim import LocalSimTransport, LocalSimulator
+from mcm26b.protocol.client import ActionRejected, SimulatorClient
+
+
+class TimingModelTests(unittest.TestCase):
+    """附件1表2 / 附件2第10节示例逐步分解。"""
+
+    def setUp(self):
+        self.cost = CostConfig()
+
+    def test_measure_step2_move_500_no_switch(self):
+        breakdown = measure_cost((0, 0), (300, 400), 1, 1, self.cost)
+        self.assertAlmostEqual(breakdown.move_s, 100)   # 500m / 5(m/s)
+        self.assertAlmostEqual(breakdown.switch_s, 0)   # 初始频道即1
+        self.assertAlmostEqual(breakdown.action_s, 5)
+        self.assertAlmostEqual(breakdown.total_s, 105)
+
+    def test_measure_step3_in_place_switch_channel(self):
+        breakdown = measure_cost((300, 400), (300, 400), 1, 2, self.cost)
+        self.assertAlmostEqual(breakdown.move_s, 0)
+        self.assertAlmostEqual(breakdown.switch_s, 1)
+        self.assertAlmostEqual(breakdown.total_s, 6)
+
+    def test_clear_step4_move_400_no_target(self):
+        breakdown = clear_cost((300, 400), (300, 0), success=False, cost=self.cost)
+        self.assertAlmostEqual(breakdown.move_s, 80)    # 400m / 5
+        self.assertAlmostEqual(breakdown.switch_s, 0)   # /clear 不产生换频道耗时
+        self.assertAlmostEqual(breakdown.action_s, 3)   # 未发现=光学定位3s
+        self.assertAlmostEqual(breakdown.total_s, 83)
+
+    def test_measure_step5_same_channel_after_clear(self):
+        # 第4步 /clear 后测向机仍是频道2，原地再测频道2无切换耗时。
+        breakdown = measure_cost((300, 0), (300, 0), 2, 2, self.cost)
+        self.assertAlmostEqual(breakdown.total_s, 5)
+
+    def test_virtual_clock_walk(self):
+        """累积虚拟时刻逐步得到附件给定值 0/105/111/194/199/199。"""
+        virtual = 0.0
+        expected = [0, 105, 111, 194, 199, 199]
+        sequence = [
+            measure_cost((0, 0), (300, 400), 1, 1, self.cost),
+            measure_cost((300, 400), (300, 400), 1, 2, self.cost),
+            clear_cost((300, 400), (300, 0), False, self.cost),
+            measure_cost((300, 0), (300, 0), 2, 2, self.cost),
+            None,  # /exit
+        ]
+        results = [virtual]
+        for breakdown in sequence:
+            virtual += 0 if breakdown is None else breakdown.total_s
+            results.append(round(virtual, 6))
+        self.assertEqual(results, [float(v) for v in expected])
+
+
+class StateMachineTests(unittest.TestCase):
+    """状态更新规则：accepted=false 不更新；/clear 不动频道。"""
+
+    @staticmethod
+    def _accepted_measure(virtual):
+        return {"accepted": True, "real_timestamp_ms": 0,
+                "virtual_time_s": virtual,
+                "measure_result": "no_signal"}
+
+    def test_clear_keeps_channel(self):
+        state = RobotState()
+        state.entered = True
+        measure_req = {"position": {"x": 300, "y": 400}, "channel": 2}
+        state.apply_measure(measure_req, self._accepted_measure(106))
+        self.assertEqual(state.channel, 2)
+        clear_req = {"position": {"x": 300, "y": 0}, "channel": 3}
+        response = {"accepted": True, "real_timestamp_ms": 0,
+                    "virtual_time_s": 189,
+                    "clear_result": CLEAR_NO_TARGET}
+        state.apply_clear(clear_req, response)
+        self.assertEqual(state.channel, 2, "/clear 不得改变测向机频道")
+
+    def test_rejected_response_never_updates(self):
+        state = RobotState(position=(10, 20), channel=5, virtual_time_s=77)
+        rejected = {"accepted": False, "real_timestamp_ms": 1, "virtual_time_s": 0}
+        request = {"position": {"x": 0, "y": 0}, "channel": 1}
+        with self.assertRaises(StateError):
+            state.apply_measure(request, rejected)
+        with self.assertRaises(StateError):
+            state.apply_clear(request, rejected)
+        with self.assertRaises(StateError):
+            state.apply_enter(rejected)
+        self.assertEqual((state.position, state.channel, state.virtual_time_s),
+                         ((10, 20), 5, 77), "accepted=false 不得更新任何状态")
+
+    def test_virtual_time_zero_of_rejection_is_not_a_clock(self):
+        """accepted=false 的 virtual_time_s=0 不是当前时刻（回归附件2 4.1）。"""
+        state = RobotState(virtual_time_s=300)
+        rejected = {"accepted": False, "real_timestamp_ms": 9, "virtual_time_s": 0}
+        with self.assertRaises(StateError):
+            state.apply_measure({"position": {"x": 0, "y": 0}, "channel": 1}, rejected)
+        self.assertEqual(state.virtual_time_s, 300)
+
+    def test_strict_mode_flags_prediction_gap(self):
+        state = RobotState()
+        state.entered = True
+        request = {"position": {"x": 100, "y": 0}, "channel": 1}
+        bad = {"accepted": True, "real_timestamp_ms": 0, "virtual_time_s": 3,
+               "measure_result": "no_signal"}   # 应为 25s，伪造 3s
+        with self.assertRaises(StateError):
+            state.apply_measure(request, bad, strict=True)
+
+
+class FieldTableSimTests(unittest.TestCase):
+    """字段表与错误语义（附件2 5.1/5.3/6.3/7.4）。"""
+
+    def setUp(self):
+        self.sim = LocalSimulator([], robot_id="T001")
+        self.base = {"arena_id": "default", "robot_id": "T001"}
+
+    def _measure(self, **override):
+        payload = {**self.base, "request_id": "m1",
+                   "position": {"x": 0, "y": 0}, "channel": 1, **override}
+        return self.sim.handle("/measure", payload)
+
+    def test_measure_before_enter_rejected(self):
+        status, body = self._measure()
+        self.assertEqual((status, body["accepted"]), (200, False))
+        self.assertEqual(body["virtual_time_s"], 0)
+        self.assertEqual(set(body) >= {"accepted", "real_timestamp_ms", "virtual_time_s"}, True)
+
+    def test_unknown_field_rejected_but_id_not_consumed(self):
+        self.sim.handle("/enter", {**self.base, "request_id": "e1"})
+        status, body = self._measure(extra_field=1)          # 未声明字段
+        self.assertEqual((status, body["accepted"]), (200, False))
+        status, body = self._measure()                        # 同 ID 修正后可复用
+        self.assertEqual((status, body["accepted"]), (200, True))
+
+    def test_wrong_robot_id_rejected(self):
+        status, body = self.sim.handle("/enter", {**self.base, "robot_id": "OTHER",
+                                                  "request_id": "e1"})
+        self.assertEqual((status, body["accepted"]), (200, False))
+
+    def test_channel_and_coordinate_validation_400(self):
+        self.sim.handle("/enter", {**self.base, "request_id": "e1"})
+        for channel in (0, 21, 1.5):
+            status, _ = self._measure(request_id=f"c{channel}", channel=channel)
+            self.assertEqual(status, 400)
+        status, _ = self._measure(request_id="far",
+                                  position={"x": 2_000_001, "y": 0})
+        self.assertEqual(status, 400)
+
+    def test_position_unknown_field_rejected(self):
+        self.sim.handle("/enter", {**self.base, "request_id": "e1"})
+        status, body = self._measure(request_id="p1",
+                                     position={"x": 0, "y": 0, "z": 0})
+        self.assertEqual((status, body["accepted"]), (200, False))
+
+    def test_double_enter_rejected_then_measure_ok(self):
+        status, body = self.sim.handle("/enter", {**self.base, "request_id": "e1"})
+        self.assertEqual(body["accepted"], True)
+        status, body = self.sim.handle("/enter", {**self.base, "request_id": "e2"})
+        self.assertEqual((status, body["accepted"]), (200, False))
+        status, body = self._measure(request_id="m1")
+        self.assertEqual(body["accepted"], True)
+
+
+class WorkedExampleEndToEndTests(unittest.TestCase):
+    """完整链路：客户端 → 本地模拟器复现附件示例。"""
+
+    def test_attachment_example_reaches_199(self):
+        simulator = LocalSimulator([], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+        client.enter()
+        self.assertTrue(client.state.entered)
+        self.assertEqual((client.state.position, client.state.channel), ((0.0, 0.0), 1))
+        got = [client.measure((300, 400), 1).virtual_time_s,
+               client.measure((300, 400), 2).virtual_time_s,
+               client.clear((300, 0), 3).virtual_time_s,
+               client.measure((300, 0), 2).virtual_time_s]
+        self.assertEqual([round(v, 6) for v in got], [105, 111, 194, 199])
+        self.assertEqual(client.state.channel, 2)
+        info = client.exit()
+        self.assertEqual((info.reason, round(info.virtual_time_s, 6)),
+                         ("user_exit", 199))
+        self.assertEqual(client.state.mismatches, [], "预测与服务器计时应完全一致")
+
+    def test_rejected_action_keeps_client_state(self):
+        simulator = LocalSimulator([], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+        with self.assertRaises(ActionRejected):
+            client.measure((0, 0), 1)     # 未 enter
+        self.assertEqual(client.state.virtual_time_s, 0)
+        self.assertFalse(client.state.entered)
+        client.enter()
+        self.assertEqual(client.state.virtual_time_s, 0)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/uv.lock b/uv.lock
index 61eb41d..8c8f9da 100644
--- a/uv.lock
+++ b/uv.lock
@@ -3,6 +3,363 @@ revision = 3
 requires-python = ">=3.10"
 
 [[package]]
-name = "math"
-version = "0.1.0"
-source = { virtual = "." }
+name = "certifi"
+version = "2026.7.22"
+source = { registry = "https://mirrors.aliyun.com/pypi/simple/" }
+sdist = { url = "https://mirrors.aliyun.com/pypi/packages/a3/c2/24167ea9858356b47a87a50d39908bfdb72ceeefe0041586e704e5376b3a/certifi-2026.7.22.tar.gz", hash = "sha256:741e2c3b351ddf169a738da9f2c048608ff7f2c5cc02f1ebc6b118bb090d5d55" }
+wheels = [
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+]
+
+[[package]]
+name = "charset-normalizer"
+version = "3.5.1"
+source = { registry = "https://mirrors.aliyun.com/pypi/simple/" }
+sdist = { url = "https://mirrors.aliyun.com/pypi/packages/e5/3f/143b048436775b0f76ac3eec145c019e8173ccc2885c8f20319b996d5e83/charset_normalizer-3.5.1.tar.gz", hash = "sha256:6117b84ea48435e5356dc737f5121485c30920ba43375fa7b434fd753df0eac3" }
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