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/events.py

@@ -0,0 +1,108 @@
+"""
+事件日志模块 — V2 可观测性基础设施。
+JSONL 格式无限流式追加，与 state.json 互补：state.json 是当前快照，事件日志是完整时间线。
+"""
+
+from __future__ import annotations
+
+import contextlib
+import json
+import logging
+import os
+import tempfile
+from datetime import datetime, timezone
+from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
+# 事件类型常量 — 所有 emit 调用必须使用常量，禁止字符串字面量
+TASK_DISPATCHED = "task.dispatched"
+TASK_ENTERED = "task.entered"
+TASK_FINISHED = "task.finished"
+TASK_COMPLETED = "task.completed"
+TASK_BLOCKED = "task.blocked"
+MERGE_STARTED = "merge.started"
+MERGE_COMPLETED = "merge.completed"
+REPAIR_CREATED = "repair.created"
+REPAIR_RESOLVED = "repair.resolved"
+INTERVENTION_STALL = "intervention.stall"
+XDB_CAPTURED = "xdb.captured"
+DEBUG_SESSION = "debug.session"
+CONTEXT_COMPACTED = "context.compacted"
+DEPLOY_COMPLETED = "deploy.completed"
+TEST_RUN = "test.run"
+SEC_SCAN = "sec.scan"
+REVIEW_SESSION = "review.session"
+ENGINE_ENTERED = "engine.entered"
+ENGINE_CYCLE = "engine.cycle"
+ENG_REPLAN_TRIGGERED = "eng.replan.triggered"
+ENG_BLOCKED = "eng.blocked"
+WORKER_TIMEOUT = "worker.timeout"
+WORKTREE_MERGE_CONFLICT = "worktree.merge.conflict"
+ARC_REPLANNED = "arc.replanned"
+ADR_CHANGE_DETECTED = "adr.change.detected"
+ADR_INVALIDATION = "adr.invalidation"
+ADR_UNFREEZED = "adr.unfreezed"
+LOCK_ACQUIRED = "lock.acquired"
+LOCK_RELEASED = "lock.released"
+STALE_LOCK_CLEANED = "stale_lock.cleaned"
+
+
+def now_iso() -> str:
+    return datetime.now(timezone.utc).isoformat()
+
+
+class EventLog:
+    """结构化事件日志（JSONL 格式），支持轮转截断。
+
+    P1-GAP18: 原子轮转 — open(tmp)+os.replace，每 N 次 emit 检查一次避免每次读文件。
+    """
+
+    MAX_LINES = 10000
+    ROTATE_CHECK_EVERY = 128  # 每 128 次 emit 检查一次轮转
+
+    def __init__(self, path: Path, max_lines: int = MAX_LINES):
+        self._path = path
+        self._max_lines = max_lines
+        self._emit_count = 0  # P1-GAP18: 计数器，避免每次 emit 都读文件
+
+    def emit(self, event_type: str, payload: dict | None = None) -> None:
+        entry = {
+            "ts": now_iso(),
+            "type": event_type,
+            **(payload or {}),
+        }
+        self._path.parent.mkdir(parents=True, exist_ok=True)
+        with open(self._path, "a") as f:
+            f.write(json.dumps(entry, ensure_ascii=False) + "\n")
+        self._emit_count += 1
+        if self._emit_count % self.ROTATE_CHECK_EVERY == 0:
+            self._maybe_rotate()
+
+    def _maybe_rotate(self) -> None:
+        """原子轮转：先写临时文件，再 os.replace。"""
+        if not self._path.exists():
+            return
+        try:
+            with open(self._path, "r", encoding="utf-8", errors="replace") as f:
+                lines = f.readlines()
+            if len(lines) <= self._max_lines:
+                return
+
+            keep_count = self._max_lines // 2
+            kept_lines = lines[-keep_count:] if len(lines) > keep_count else lines
+
+            fd, tmp_path = tempfile.mkstemp(dir=self._path.parent, suffix=".tmp")
+            os.close(fd)
+
+            try:
+                with open(tmp_path, "w", encoding="utf-8") as f:
+                    f.writelines(kept_lines)
+                os.replace(tmp_path, self._path)
+                logger.info("rotated event log %s, kept %d/%d lines", self._path, len(kept_lines), len(lines))
+            except Exception:
+                with contextlib.suppress(Exception):
+                    os.unlink(tmp_path)
+                raise
+        except OSError:
+            pass