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>

lib/air_runtime/modes/tst_mode.py

@@ -0,0 +1,35 @@
+"""AirTst mode — V2 测试运行器。"""
+
+from pathlib import Path
+from air_runtime.test_runtime import TestRunner
+from air_runtime.io import safe_json_load
+from air_runtime.paths import airplan_root, event_log_path
+from air_runtime.events import EventLog, TEST_RUN
+
+
+def main(args) -> None:
+    project_root = Path(args.project).expanduser().resolve()
+    tid = args.task_id
+    sub = args.sub or "status"
+
+    if sub == "run" and args.framework:
+        runner = TestRunner()
+        result = runner.run(tid, project_root, args.framework)
+
+        log = EventLog(event_log_path(project_root))
+        log.emit(TEST_RUN, {
+            "taskId": tid,
+            "framework": result.framework,
+            "total": result.total,
+            "passed": result.passed,
+            "failed": result.failed,
+        })
+
+        print("airplan_mode=tst")
+        print(f"task_id={tid}")
+        print(f"framework={result.framework}")
+        print(f"total={result.total} passed={result.passed} failed={result.failed}")
+    else:
+        paths = airplan_root(project_root) / "state" / "airtst"
+        state = safe_json_load(paths / "state.json") or {}
+        print(f"airplan_mode=tst\nenabled={state.get('enabled', False)}")