fix: M1 git rm 误提交的安装目录文件 + S1 docstring 修正 + S2 去掉 CHECK 约束（司马懿 Review #111）

src/blackboard/db.py

@@ -293,7 +293,7 @@ _SCHEMA_STATEMENTS = [
         id INTEGER PRIMARY KEY AUTOINCREMENT,
         task_id TEXT NOT NULL REFERENCES tasks(id),
         author TEXT NOT NULL,
-        comment_type TEXT NOT NULL DEFAULT 'general' CHECK (comment_type IN ('general','handoff','observation','review','rebuttal','rebuttal_response','debate_argument','debate_rebuttal','debate_judgment','action_report')),
+        comment_type TEXT NOT NULL DEFAULT 'general',
         body TEXT NOT NULL,
         mentions TEXT,
         created_at TEXT NOT NULL DEFAULT (datetime('now'))

src/daemon/toolchain_handler.py

@@ -330,7 +330,7 @@ class ToolchainHandler(BaseTaskHandler):
                 task_id, agent_id, verify, db_path)
 
     def _classify_failure(self, verify: VerifyResult) -> str:
-        """分类失败类型:business / system / infrastructure"""
+        """分类失败类型:business / infrastructure（system 通过升级到达）"""
         # verify_error 或 DB 不可用 → 基础设施失败
         if verify.reason == "verify_error":
             return "infrastructure"