fix(lint): 修复 PR #14 引入的 lint 回退 (119→0)

PR #14 从旧分支复制文件导致回退了 PR #10 的 lint 修复。
修复内容:
- autoflake 移除未使用导入/变量
- autopep8 修复缩进/空格
- 手动修复 F821(pathlib→Path), F541(f-string), F841(未使用变量)
- 所有修复均通过 flake8 --max-line-length=120 --extend-ignore=E501 检查 (0 errors)

src/daemon/router.py

@@ -107,7 +107,8 @@ class AgentRouter:
 
         # ── 快速路径 2: retry → 原执行者 ──
         if action_type == "retry":
-            current = task_info.get("current_agent") or task_info.get("assignee")
+            current = task_info.get(
+                "current_agent") or task_info.get("assignee")
             if current and current in self.agent_profiles:
                 return RouteDecision(
                     agent_id=current,
@@ -119,7 +120,8 @@ class AgentRouter:
         # ── Mode B: Agent 声明式交接 ──
         next_cap = task_info.get("next_capability")
         if next_cap and self._validate_capability(next_cap):
-            current = task_info.get("current_agent") or task_info.get("assignee")
+            current = task_info.get(
+                "current_agent") or task_info.get("assignee")
             exclude = {current} if current else set()
             matched = self._match_capability(next_cap, exclude)
             if matched:
@@ -129,7 +131,9 @@ class AgentRouter:
                     mode="agent_handoff",
                     latency_ms=int((time.monotonic() - start) * 1000),
                 )
-            logger.info("next_capability '%s' no match, delegate to coordinator", next_cap)
+            logger.info(
+                "next_capability '%s' no match, delegate to coordinator",
+                next_cap)
 
         # ── 快速路径 3: 生命周期流转查表 ──
         lifecycle = self.LIFECYCLE_CAPABILITY.get(action_type)
@@ -140,7 +144,8 @@ class AgentRouter:
             exclude_current = lifecycle.get("exclude_current", False)
             exclude = set()
             if exclude_current:
-                current = task_info.get("current_agent") or task_info.get("assignee")
+                current = task_info.get(
+                    "current_agent") or task_info.get("assignee")
                 if current:
                     exclude.add(current)
             matched = self._match_capability(cap, exclude)
@@ -154,7 +159,8 @@ class AgentRouter:
 
         # ── 快速路径 4: 有 assignee 且非生命周期流转 ──
         assignee = task_info.get("assignee")
-        if assignee and assignee in self.agent_profiles and action_type not in ("review", "escalation"):
+        if assignee and assignee in self.agent_profiles and action_type not in (
+                "review", "escalation"):
             return RouteDecision(
                 agent_id=assignee,
                 reason=f"Direct assignee: {assignee}",