feat(backend): Agent 系统和 API 增强

- task_delegator: 完善团队任务分发逻辑
- runtime API: 增强运行时管理功能
- skills_manager: 技能管理改进
- tool_guard: 工具调用守卫优化
- evo_agent: 核心 Agent 改进

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

backend/agents/skills_manager.py

@@ -5,6 +5,7 @@ from pathlib import Path
 import shutil
 import tempfile
 import zipfile
+from threading import Lock
 from typing import Any, Dict, Iterable, Iterator, List, Optional, Set
 from urllib.parse import urlparse
 from urllib.request import urlretrieve
@@ -39,6 +40,7 @@ class SkillsManager:
             self.project_root / "backend" / "skills" / "customized"
         )
         self.runs_root = self.project_root / "runs"
+        self._lock = Lock()
 
     def get_active_root(self, config_name: str) -> Path:
         return self.runs_root / config_name / "skills" / "active"
@@ -737,7 +739,7 @@ class SkillsManager:
             if local_root.exists():
                 watched_paths.append(local_root)
 
-        handler = _SkillsChangeHandler(watched_paths, callback)
+        handler = _SkillsChangeHandler(watched_paths, callback, self._lock)
         observer = Observer()
         for path in watched_paths:
             observer.schedule(handler, str(path), recursive=True)
@@ -759,11 +761,13 @@ class SkillsManager:
             Map of agent_id -> list of reloaded skill paths, or empty dict
             if no changes were detected.
         """
-        changed = self._pending_skill_changes.get(config_name)
-        if not changed:
-            return {}
+        with self._lock:
+            changed = self._pending_skill_changes.get(config_name)
+            if not changed:
+                return {}
+
+            self._pending_skill_changes[config_name] = set()
 
-        self._pending_skill_changes[config_name] = set()
         return self.prepare_active_skills(config_name, agent_defaults)
 
     # -------------------------------------------------------------------------
@@ -821,10 +825,12 @@ class _SkillsChangeHandler(FileSystemEventHandler):
         self,
         watched_paths: List[Path],
         callback: Optional[Any] = None,
+        lock: Optional[Lock] = None,
     ) -> None:
         super().__init__()
         self._watched_paths = watched_paths
         self._callback = callback
+        self._lock = lock
 
     def on_any_event(self, event: FileSystemEvent) -> None:
         if event.is_directory:
@@ -832,9 +838,16 @@ class _SkillsChangeHandler(FileSystemEventHandler):
         src_path = Path(event.src_path)
         for watched in self._watched_paths:
             if src_path.is_relative_to(watched):
-                SkillsManager._pending_skill_changes.setdefault(
-                    self._run_id_from_path(src_path), set()
-                ).add(src_path)
+                run_id = self._run_id_from_path(src_path)
+                if self._lock:
+                    with self._lock:
+                        SkillsManager._pending_skill_changes.setdefault(
+                            run_id, set()
+                        ).add(src_path)
+                else:
+                    SkillsManager._pending_skill_changes.setdefault(
+                        run_id, set()
+                    ).add(src_path)
                 if self._callback:
                     self._callback([src_path])
                 break