feat: AirPlan V2 — 全专家插件强制路由 + 事件系统规范化

P0-8 扩大: do_mode.py finish_worker 全专家插件强制路由
- GUI→XDB, network→NDB, C/C++→SDB, done→Rvr, blocked/failed→Dbg
- 证据去重: 已有 xdbSessions/ndbSessions/sdbReports/rvrReviewed 则跳过

P1-GAP17: 事件 emit 规范化
- 新增 7 个事件常量 (TASK_ENTERED, TASK_FINISHED, ENGINE_ENTERED 等)
- 全部 emit 调用替换字符串字面量为常量，零残留
- 30 个事件类型常量全部定义且唯一

P1-GAP18: 事件日志原子轮转
- emit 计数器每 128 次检查轮转，避免每次 emit 读文件
- 清除未使用的 _emit_with_completion/_pending_merge_complete
- 原子轮转: tempfile+os.replace 保证不损坏

eng 极端接管: 强制调用全部专家插件 (Dbg/XDB/NDB/SDB/Rvr)
commands/do.md: 更新为全专家插件路由文档

全量测试: 69 通过, 0 失败

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

commands/airplan.md

@@ -0,0 +1,46 @@
+---
+description: "AirPlan V2 - unified scheduler with 12 modes"
+argument-hint: "[arc|eng|do|dbg|xdb|sdb|ndb|ctx|dep|tst|sec|rvr] [sub-command]"
+allowed-tools: "[Read, Glob, Grep, Bash, Write, Edit]"
+---
+
+# /airplan
+
+AirPlan V2 - unified scheduler. V1 8 plugins merged into 1, adds 4 components, total 12 sub-modes.
+
+## Sub-modes
+
+| Mode | Role |
+|------|------|
+| arc | Architecture planner |
+| eng | Scheduler engine |
+| do | Task executor |
+| dbg | Debugger |
+| xdb | GUI validator |
+| sdb | Static analyzer |
+| ndb | Network debugger |
+| ctx | Context manager |
+| dep | Deployer |
+| tst | Test runner |
+| sec | Security scanner |
+| rvr | Requirements reviewer |
+
+## Usage
+
+1. Parse $ARGUMENTS; default to "status" when empty.
+2. Run from project root - replace MODE with first arg:
+
+```bash
+python "$HOME/plugins/airplan/scripts/airplan.py" --mode MODE --project . [OPTIONS]
+```
+
+Example: /airplan arc -> runs with --mode arc
+Example: /airplan eng monitor -> runs with --mode eng --sub monitor
+
+3. Common patterns:
+   - /airplan arc parallel-review --todo AirPlan/todo.md
+   - /airplan eng dispatch
+   - /airplan eng monitor
+   - /airplan do finish --task-id T-001 --result /path/to/result.json
+
+4. Runtime auto-bootstraps missing AirPlan/ files.