[moz] impl(§22): P1+P2 轻量路径+数据流+Round Review Gitea 适配

§22 全部未完成项一次性补齐：

A. 文档更新：
- §22.3/§22.4 Phase 1 状态更新为 ✅ 已实现
- §22.5 P0/P1/P2 标记全部完成
- §22.6/§22.7 更新实现状态

B2. flow/* label 识别（toolchain_routes.py）：
- opened 分支识别 flow/direct → 创建 executor task（跳过 discussion）
- flow/discuss 无 assignee 时走默认 discussion 路径

B3. Discussion prompt 降级机制（spawner.py）：
- DISCUSSION_PROMPT_TEMPLATE 加降级引导

B4. task_state 表 + parent_issue 解析（toolchain_routes.py）：
- _init_task_state_table: CREATE TABLE IF NOT EXISTS task_state
- _ensure_task_state: 解析 [parent #N] 写入 parent_issue
- _handle_issues assigned 分支调用

B5. _check_round_complete 双源扫描（ticker.py）：
- 扫 tasks.parent_task（黑板路径）+ task_state.parent_issue（Gitea 路径）
- 合并两个来源的 parent IDs

src/api/toolchain_routes.py

@@ -23,7 +23,7 @@ from typing import Any, Dict, List, Optional, Set, Tuple
 import httpx
 from fastapi import APIRouter, Header, Request, Response
 
-from src.blackboard.db import init_db
+from src.blackboard.db import init_db, get_connection
 from src.blackboard.models import Task
 from src.blackboard.operations import Blackboard
 from src.config.agents import AGENT_IDS
@@ -215,9 +215,54 @@ def _toolchain_db_path() -> Path:
     db = root / TOOLCHAIN_PROJECT_ID / "blackboard.db"
     db.parent.mkdir(parents=True, exist_ok=True)
     init_db(db)
+    _init_task_state_table(db)
     return db
 
 
+def _init_task_state_table(db: Path) -> None:
+    """§22.7: 创建 task_state 表（如不存在）"""
+    conn = get_connection(db)
+    try:
+        conn.execute(
+            "CREATE TABLE IF NOT EXISTS task_state ("
+            "    issue_number INTEGER PRIMARY KEY,"
+            "    repo TEXT,"
+            "    parent_issue INTEGER,"
+            "    status TEXT DEFAULT 'pending',"
+            "    action_type TEXT,"
+            "    retry_count INTEGER DEFAULT 0,"
+            "    dispatch_count INTEGER DEFAULT 0,"
+            "    round_count INTEGER DEFAULT 0,"
+            "    created_at TEXT,"
+            "    updated_at TEXT"
+            ")"
+        )
+        conn.execute(
+            "CREATE INDEX IF NOT EXISTS idx_task_state_parent "
+            "ON task_state(parent_issue)"
+        )
+        conn.commit()
+    except Exception:
+        logger.debug("task_state table init skipped (may already exist)", exc_info=True)
+    finally:
+        conn.close()
+
+
+def _ensure_task_state(db: Path, issue_number: int, repo: str,
+                       parent_issue: int) -> None:
+    """§22.7: 记录 sub Issue 的 parent_issue 映射到 task_state 表"""
+    conn = get_connection(db)
+    try:
+        conn.execute(
+            "INSERT OR IGNORE INTO task_state (issue_number, repo, parent_issue, status, created_at) "
+            "VALUES (?, ?, ?, 'pending', datetime('now'))",
+            (issue_number, repo, parent_issue),
+        )
+        conn.commit()
+    finally:
+        conn.close()
+
+
 def _send_toolchain_task(
     to_agent: str | None,
     title: str,
@@ -1085,6 +1130,14 @@ async def _handle_issues(payload: Dict[str, Any]) -> None:
                 },
             )
 
+        # §22.7: 解析 [parent #{N}] 写入 task_state（toolchain DB）
+        parent_match = re.search(r'\[parent\s* #(\d+)\]', issue_title, re.IGNORECASE)
+        if parent_match:
+            parent_issue_num = int(parent_match.group(1))
+            _ensure_task_state(_toolchain_db_path(), issue_number, repo, parent_issue_num)
+            logger.info("Issue #%s: parent_issue=%d recorded in task_state",
+                        issue_number, parent_issue_num)
+
     elif action == "closed":
         # §21 §11 Issue closed 纯通知（auto-pass）
         assignee_login = ""
@@ -1113,14 +1166,38 @@ async def _handle_issues(payload: Dict[str, Any]) -> None:
             assignees = list(assignees) + [single_assignee]
 
         if not assignees and not ("部署失败" in issue_title):
-            # 无 assignee + 非部署失败 → 检查是否有 type/* label
+            # 无 assignee + 非部署失败 → 检查 flow/* 和 type/* label
             labels_list_opened = [
                 lbl.get("name", "") for lbl in (issue.get("labels") or [])
             ]
             has_type_label = any(
                 lbl.lower().startswith("type/") for lbl in labels_list_opened
             )
-            if has_type_label:
+            has_flow_direct = any(
+                lbl.lower() == "flow/direct" for lbl in labels_list_opened
+            )
+            # §22.6: flow/direct → 强制 Direct 路径（跳过 discussion）
+            # 即使无 assignee 也直接创建 executor task（daemon 不自动 assign，
+            # 而是走 delegate 给庞统分配）
+            if has_flow_direct and has_type_label:
+                # flow/direct 无 assignee → 走 delegate 路径（和 discussion 一样不 assign）
+                # 但 action_type 标记为 issue_assigned 让 ticker 走 executor 路径
+                _send_toolchain_task(
+                    to_agent=None,
+                    title=f"Issue 待分配: {issue_title} ({repo}#{issue_number})",
+                    description=f"## Issue (flow/direct)\n\n**{repo}#{issue_number}**: {issue_title}\n\n{issue.get('body', '') or '(无描述)'}",
+                    event_type="issue_assigned",
+                    action_type="issue_assigned",
+                    steps=[],
+                    context_data={
+                        "issue_number": issue_number,
+                        "repo": repo,
+                        "issue_title": issue_title,
+                        "issue_body": issue.get("body", "") or "",
+                    },
+                )
+                logger.info("Issue #%s: flow/direct → executor task (no assignee)", issue_number)
+            elif has_type_label:
                 issue_body = issue.get("body", "") or "(无描述)"
                 title_discussion = f"Issue 讨论: {issue_title} ({repo}#{issue_number})"
                 _send_toolchain_task(