fix(spawner): crash cooldown分级 + inform mail crash误标done修复

- crashed outcome cooldown 60s（vs 其他 300s）
- import init_db
- whitespace/lint fixes

src/daemon/spawner.py

@@ -15,7 +15,7 @@ from datetime import datetime
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
-from src.blackboard.db import get_connection
+from src.blackboard.db import get_connection, init_db
 
 logger = logging.getLogger("moziplus-v2.spawner")
 
@@ -163,7 +163,6 @@ class AgentBusyError(Exception):
 
     #07: reason 字段区分具体原因,便于 dispatcher 层区分处理。
     """
-
     def __init__(self, agent_id: str, reason: str = "busy", detail: Optional[dict] = None):
         self.agent_id = agent_id
         self.reason = reason   # counter_blocked / session_locked / session_running / session_compacting / session_stuck
@@ -380,6 +379,7 @@ curl -X POST http://{self.api_host}:{self.api_port}/api/projects/{project_id}/ta
             return router.agent_profiles.get(agent_id)
         return None
 
+
     def _build_mail_prompt(self, task_id: str, title: str, description: str,
                             must_haves: str, agent_id: str) -> str:
         """构建 Mail 专用精简模板"""
@@ -848,10 +848,13 @@ curl -X POST http://{api_host}:{api_port}/api/projects/{project_id}/tasks/{task_
             #      A8(gateway_unreachable), A11(lock_conflict),
             #      A10(compact_failed), A12(agent_error)
             # v2.8.1 Fix-3a: crash 类 outcome 设 cooldown,给 agent session 恢复时间
-            if outcome in ("crashed", "compact_failed", "process_crash", "session_stuck",
+            if outcome == "crashed" and self.counter:
+                self.counter.set_cooldown(agent_id, seconds=60)
+                logger.info("Crash cooldown set for %s: 60s (outcome=%s)", agent_id, outcome)
+            elif outcome in ("compact_failed", "process_crash", "session_stuck",
                            "compact_hanging", "agent_error", "compact_interrupted") and self.counter:
                 self.counter.set_cooldown(agent_id, seconds=300)  # 5 分钟
-                logger.info("Crash/error cooldown set for %s: 300s (outcome=%s)", agent_id, outcome)
+                logger.info("Error cooldown set for %s: 300s (outcome=%s)", agent_id, outcome)
             # F1: 不可恢复 outcome → 立刻标 failed + 写黑板
             if outcome in ("auth_failed", "agent_error") and db_path and task_id:
                 logger.error("Task %s: unrecoverable outcome=%s, marking failed immediately", task_id, outcome)
@@ -878,6 +881,9 @@ curl -X POST http://{api_host}:{api_port}/api/projects/{project_id}/tasks/{task_
         except Exception:
             pass
 
+        stderr_text = b"".join(stderr_chunks).decode("utf-8", errors="replace")
+
+        # 检查 session 状态
         state = self._check_session_state(agent_id)
 
         # B1: 假死 - 先复活,连续假死 ≥2 次再 failed
@@ -1213,7 +1219,7 @@ curl -X POST http://{api_host}:{api_port}/api/projects/{project_id}/tasks/{task_
         实测 50KB 在长对话中不够（compact 记录被推出窗口导致漏检）。
         正常扫描量不变：从尾部往前扫，遇到超过 15min 的 timestamp 即 break。
         """
-        if not session_file or not Path(session_file).exists():
+        if not session_file or not pathlib.Path(session_file).exists():
             return False
         try:
             from datetime import datetime, timezone