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/cli/blackboard.py

@@ -10,7 +10,7 @@ from typing import List, Optional
 
 from src.blackboard.operations import Blackboard
 from src.utils import get_data_root
-from src.blackboard.models import Task, Comment, Output, Decision, Observation, Review, Experience
+from src.blackboard.models import Task, Review
 from src.blackboard.queries import Queries
 from src.blackboard.registry import ProjectRegistry
 
@@ -35,7 +35,9 @@ def _get_queries(project_id: str) -> Queries:
 
 
 def build_blackboard_parser() -> argparse.ArgumentParser:
-    parser = argparse.ArgumentParser(prog="blackboard", description="Agent blackboard operations")
+    parser = argparse.ArgumentParser(
+        prog="blackboard",
+        description="Agent blackboard operations")
     sub = parser.add_subparsers(dest="command")
 
     # read
@@ -206,7 +208,11 @@ def _cmd_comment(opts) -> int:
 
 def _cmd_decide(opts) -> int:
     bb = _get_bb(opts.project)
-    did = bb.add_decision(opts.task_id, opts.decider, opts.decision, opts.rationale)
+    did = bb.add_decision(
+        opts.task_id,
+        opts.decider,
+        opts.decision,
+        opts.rationale)
     print(f"Decision recorded: {did}")
     return 0
 
@@ -251,7 +257,8 @@ def _print_tasks(tasks, as_json: bool):
 
 
 def build_admin_parser() -> argparse.ArgumentParser:
-    parser = argparse.ArgumentParser(prog="admin", description="Admin operations")
+    parser = argparse.ArgumentParser(
+        prog="admin", description="Admin operations")
     sub = parser.add_subparsers(dest="command")
 
     # project create
@@ -262,7 +269,7 @@ def build_admin_parser() -> argparse.ArgumentParser:
     p_pc.add_argument("--description", default="")
 
     # project list
-    p_pl = sub.add_parser("project-list", help="List projects")
+    sub.add_parser("project-list", help="List projects")
 
     # project archive
     p_pa = sub.add_parser("project-archive", help="Archive project")
@@ -300,7 +307,8 @@ def run_admin_cli(args: Optional[List[str]] = None) -> int:
             for pid, info in projects.items():
                 status = info.get("status", "?")
                 agents = ",".join(info.get("agents", []))
-                print(f"  {pid}  [{status}]  {info.get('name', '')}  agents: {agents}")
+                print(
+                    f"  {pid}  [{status}]  {info.get('name', '')}  agents: {agents}")
             return 0
 
         elif opts.command == "project-archive":