feat: P1-21 补充 — ADRWatcher 自动检测 + PartialReplanner 局部重规划

- 新增 adr_watcher.py: SHA256 hash 监控 ADR 文件变更
  - snapshot() 初始快照, detect_changes() 增量检测
  - 识别 new/modified/superseded/deleted 四种变更类型
  - _parse_status() 解析 ADR Status 字段
- 新增 partial_replanner.py: 局部重规划器
  - replan() 仅生成受影响任务的替代计划
  - _extract_stable_interfaces() 提取未受影响 DONE 任务接口约束
  - 产出 replan-request.json 供 Arc 读取
- Eng monitor_engine 集成 ADR 检测: 每轮轮询调用 _detect_adr_changes()
- Eng handle_adr_invalidation 集成 PartialReplanner 输出
- events.py 新增 ADR 变更相关事件常量
- task_graph.py apply_full_replace 保留 DISPATCHED, 不保留 INVALIDATED
- 10 项补充测试全通过，含完整 ADR 流程场景

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

lib/air_runtime/adr_watcher.py

@@ -0,0 +1,109 @@
+"""
+ADR 文件变更监控 — P1-21 ADR 变更自动检测。
+基于 SHA256 hash 对比检测 ADR 文件变更，自动触发级联失效。
+"""
+
+from __future__ import annotations
+
+import hashlib
+import re
+from dataclasses import dataclass, field
+from pathlib import Path
+
+
+@dataclass
+class ADRChange:
+    """ADR 文件变更记录。"""
+    adr_id: str
+    kind: str  # "new" | "superseded" | "modified"
+    path: str = ""
+    old_hash: str = ""
+    new_hash: str = ""
+
+
+class ADRWatcher:
+    """监控 ADR 文件变更，自动触发级联失效。
+
+    AirEng 在每轮轮询时调用 detect_changes()，
+    发现 superseded 或 modified 变更时自动触发 invalidate_by_adr()。
+    """
+
+    def __init__(self, adr_dir: Path):
+        self._adr_dir = adr_dir
+        self._known_hashes: dict[str, str] = {}
+
+    def snapshot(self) -> None:
+        """启动时记录所有 ADR 的内容 hash。"""
+        if not self._adr_dir.exists():
+            return
+        for adr_file in sorted(self._adr_dir.glob("ADR-*.md")):
+            adr_id = self._extract_adr_id(adr_file)
+            self._known_hashes[adr_id] = hashlib.sha256(
+                adr_file.read_bytes()
+            ).hexdigest()
+
+    def detect_changes(self) -> list[ADRChange]:
+        """对比当前 ADR hash 与已知 hash，返回变更列表。"""
+        if not self._adr_dir.exists():
+            return []
+
+        changes: list[ADRChange] = []
+        seen_ids: set[str] = set()
+
+        for adr_file in sorted(self._adr_dir.glob("ADR-*.md")):
+            adr_id = self._extract_adr_id(adr_file)
+            seen_ids.add(adr_id)
+            current_hash = hashlib.sha256(adr_file.read_bytes()).hexdigest()
+            old_hash = self._known_hashes.get(adr_id)
+
+            if old_hash is None:
+                changes.append(ADRChange(
+                    adr_id=adr_id, kind="new",
+                    path=str(adr_file), old_hash="", new_hash=current_hash,
+                ))
+            elif current_hash != old_hash:
+                status = self._parse_status(adr_file)
+                if status == "superseded":
+                    changes.append(ADRChange(
+                        adr_id=adr_id, kind="superseded",
+                        path=str(adr_file), old_hash=old_hash, new_hash=current_hash,
+                    ))
+                else:
+                    changes.append(ADRChange(
+                        adr_id=adr_id, kind="modified",
+                        path=str(adr_file), old_hash=old_hash, new_hash=current_hash,
+                    ))
+            self._known_hashes[adr_id] = current_hash
+
+        # 检查被删除的 ADR
+        for adr_id in list(self._known_hashes.keys()):
+            if adr_id not in seen_ids:
+                changes.append(ADRChange(
+                    adr_id=adr_id, kind="deleted",
+                    path="", old_hash=self._known_hashes[adr_id], new_hash="",
+                ))
+                del self._known_hashes[adr_id]
+
+        return changes
+
+    @staticmethod
+    def _extract_adr_id(adr_file: Path) -> str:
+        """从文件名提取 ADR ID，如 'ADR-0005-ffmpeg-decode.md' → 'ADR-0005'。"""
+        match = re.match(r"(ADR-\d+)", adr_file.stem)
+        if match:
+            return match.group(1)
+        return adr_file.stem
+
+    @staticmethod
+    def _parse_status(adr_file: Path) -> str:
+        """解析 ADR 文件中的 Status 字段。"""
+        try:
+            text = adr_file.read_text(encoding="utf-8")
+        except (OSError, UnicodeDecodeError):
+            return "unknown"
+        for line in text.splitlines():
+            lower = line.lower().strip()
+            if lower.startswith("status:") or lower.startswith("status :"):
+                status = line.split(":", 1)[1].strip().lower()
+                return status
+        return "unknown"

lib/air_runtime/events.py

@@ -33,6 +33,9 @@ SEC_SCAN = "sec.scan"
 REVIEW_SESSION = "review.session"
 ENGINE_CYCLE = "engine.cycle"
 WORKER_TIMEOUT = "worker.timeout"
+ADR_CHANGE_DETECTED = "adr.change.detected"
+ADR_INVALIDATION = "adr.invalidation"
+ADR_UNFREEZED = "adr.unfreezed"
 LOCK_ACQUIRED = "lock.acquired"
 LOCK_RELEASED = "lock.released"
 STALE_LOCK_CLEANED = "stale_lock.cleaned"

lib/air_runtime/modes/eng_mode.py

@@ -308,6 +308,32 @@ def dispatch_worker_group(project_root: Path, group_name: str = "") -> dict:
     return result
 
 
+def _detect_adr_changes(project_root: Path, state: dict) -> list:
+    """P1-21: 检查 ADR 文件变更，返回需要级联失效的变更列表。"""
+    from air_runtime.adr_watcher import ADRWatcher, ADRChange
+    adr_dir = project_root / "AirPlan" / "docs" / "architecture" / "adr"
+    if not adr_dir.exists():
+        return []
+
+    watcher = ADRWatcher(adr_dir)
+    # 从引擎状态恢复已知 hash
+    known = state.get("adrWatcherHashes", {})
+    watcher._known_hashes = known
+
+    # 首次无 snapshot → 先初始化
+    if not known:
+        watcher.snapshot()
+        state["adrWatcherHashes"] = dict(watcher._known_hashes)
+        return []
+
+    changes = watcher.detect_changes()
+    # 持久化更新后的 hash
+    state["adrWatcherHashes"] = dict(watcher._known_hashes)
+
+    # 只返回需要级联失效的变更
+    return [c for c in changes if c.kind in ("superseded", "modified")]
+
+
 def monitor_engine(project_root: Path) -> dict:
     """L1 代码级轮询：硬编码循环检测 Worker 状态，不依赖 LLM 自觉。"""
     paths = _paths(project_root)
@@ -350,6 +376,21 @@ def monitor_engine(project_root: Path) -> dict:
     except OSError:
         resource_pressure = False
 
+    # P1-21: ADR 变更自动检测
+    adr_changes = _detect_adr_changes(project_root, state)
+    if adr_changes:
+        for change in adr_changes:
+            if change.kind in ("superseded", "modified"):
+                interventions.append({
+                    "adrId": change.adr_id,
+                    "reason": f"adr-{change.kind}",
+                    "action": "invalidate-by-adr",
+                })
+                log = EventLog(event_log_path(project_root))
+                log.emit("adr.change.detected", {
+                    "adrId": change.adr_id, "kind": change.kind,
+                })
+
     # 新增：检查 pending worktree merges — merge 失败自动升级到 AirDbg
     wt_root = project_root / ".git" / "worktrees"
     if wt_root.exists():
@@ -616,6 +657,13 @@ def handle_adr_invalidation(project_root: Path, adr_id: str) -> dict:
     # 6: git revert 已合并的旧代码（按 task_id 查找对应 commit）
     revert_results = _git_revert_invalidated(project_root, report.invalidated_task_ids)
 
+    # 6.5: 生成局部重规划请求（PartialReplanner）
+    from air_runtime.partial_replanner import PartialReplanner
+    replanner = PartialReplanner()
+    partial_delta = replanner.replan(graph, report.invalidated_task_ids)
+    replan_request_path = paths["plan_dir"] / f"replan-request-{session_stamp()}.json"
+    atomic_json_write(replan_request_path, partial_delta.replan_request)
+
     # 7: 写回更新后的 task-graph.json
     from air_runtime.modes.arc_mode import _export_task_graph_json
     _export_task_graph_json(graph, tg_json)
@@ -641,6 +689,7 @@ def handle_adr_invalidation(project_root: Path, adr_id: str) -> dict:
         },
         "terminatedWorkers": terminated_workers,
         "revertResults": revert_results,
+        "replanRequestPath": str(replan_request_path),
         "nextStep": "arc-replan-then-unfreeze",
     }
 

lib/air_runtime/partial_replanner.py

@@ -0,0 +1,106 @@
+"""
+局部重规划 — P1-21 仅重新生成受 ADR 变更影响的任务子集。
+替代全量重规划，保留未受影响任务的接口约束。
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any
+
+from air_runtime.task_graph import TaskGraph, TaskNode, PlanDelta
+
+
+@dataclass
+class Interface:
+    """未受影响任务暴露的公共接口约束。"""
+    task_id: str
+    write_set: list[str] = field(default_factory=list)
+    adr_refs: list[str] = field(default_factory=list)
+
+
+@dataclass
+class ReplanContext:
+    """受影响任务的上下文信息，供 Arc 局部重规划使用。"""
+    task_id: str
+    task: str
+    files_dirs: str
+    done_when: str
+    write_set: list[str] = field(default_factory=list)
+    adr_refs: list[str] = field(default_factory=list)
+    status: str = ""
+
+
+class PartialReplanner:
+    """仅重新生成受 ADR 变更影响的任务子集。
+
+    与 incremental_replan_mode 的区别：
+    - incremental_replan_mode: 全量重建 DAG 再 diff
+    - PartialReplanner: 只对受影响部分重新规划，保留稳定接口约束
+    """
+
+    def replan(self, graph: TaskGraph, invalidated_ids: list[str],
+               new_adr_path: Path | None = None) -> PlanDelta:
+        """局部重规划：仅生成受影响任务的替代任务。
+
+        Args:
+            graph: 当前任务图（已包含 INVALIDATED 标记）
+            invalidated_ids: 被 ADR 变更级联失效的任务 ID 列表
+            new_adr_path: 新 ADR 文件路径（可选，供 Arc 参考）
+        """
+        delta = PlanDelta()
+
+        # 1. 收集受影响任务的上下文
+        affected_context = self._collect_affected_context(graph, invalidated_ids)
+
+        # 2. 提取未受影响任务的稳定接口
+        stable_interfaces = self._extract_stable_interfaces(graph, set(invalidated_ids))
+
+        # 3. 生成局部重规划指令文件（供 Arc 读取）
+        replan_request = {
+            "type": "partial-replan",
+            "invalidatedTaskIds": invalidated_ids,
+            "affectedContext": [ctx.__dict__ for ctx in affected_context],
+            "stableInterfaces": [iface.__dict__ for iface in stable_interfaces],
+            "newAdrPath": str(new_adr_path) if new_adr_path else None,
+        }
+
+        # 4. 构建增量 delta
+        # removed_tasks 已在 invalidate_by_adr 中填充
+        # added_tasks 留空——由 Arc 读取 replan-request.json 后生成新任务
+        delta.replan_request = replan_request
+
+        return delta
+
+    def _collect_affected_context(self, graph: TaskGraph,
+                                   invalidated_ids: list[str]) -> list[ReplanContext]:
+        """收集受影响任务的上下文。"""
+        contexts = []
+        for tid in invalidated_ids:
+            node = graph.nodes.get(tid)
+            if node:
+                contexts.append(ReplanContext(
+                    task_id=node.id,
+                    task=node.task,
+                    files_dirs=node.files_dirs,
+                    done_when=node.done_when,
+                    write_set=list(node.write_set),
+                    adr_refs=list(node.adr_refs),
+                    status=node.status,
+                ))
+        return contexts
+
+    def _extract_stable_interfaces(self, graph: TaskGraph,
+                                    invalidated_ids: set) -> list[Interface]:
+        """提取未受影响 DONE 任务的接口约束，确保重规划不破坏依赖。"""
+        interfaces = []
+        for nid, node in graph.nodes.items():
+            if nid not in invalidated_ids and node.status == "DONE":
+                if node.write_set or node.adr_refs:
+                    interfaces.append(Interface(
+                        task_id=node.id,
+                        write_set=list(node.write_set),
+                        adr_refs=list(node.adr_refs),
+                    ))
+        return interfaces

test_p1_21_supplement.py

@@ -0,0 +1,358 @@
+#!/usr/bin/env python3
+"""P1-21 补充功能测试：ADRWatcher + PartialReplanner"""
+
+import sys
+import tempfile
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent / "lib"))
+
+
+def test_adr_watcher_snapshot():
+    """测试 ADRWatcher 初始快照"""
+    from air_runtime.adr_watcher import ADRWatcher
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        adr_dir = Path(tmpdir)
+        # 创建 ADR 文件
+        (adr_dir / "ADR-0005-ffmpeg-decode.md").write_text(
+            "# ADR-0005: ffmpeg 解码\n\nStatus: accepted\n\n使用 ffmpeg 实现视频解码。"
+        )
+        (adr_dir / "ADR-0012-auth.md").write_text(
+            "# ADR-0012: 认证方案\n\nStatus: accepted\n\n使用 JWT 认证。"
+        )
+
+        watcher = ADRWatcher(adr_dir)
+        watcher.snapshot()
+
+        assert len(watcher._known_hashes) == 2
+        assert "ADR-0005" in watcher._known_hashes
+        assert "ADR-0012" in watcher._known_hashes
+
+        # 初始快照后无变更
+        changes = watcher.detect_changes()
+        assert len(changes) == 0
+
+        print("✓ ADRWatcher 初始快照测试通过")
+    return True
+
+
+def test_adr_watcher_detect_modified():
+    """测试 ADRWatcher 检测 ADR 修改"""
+    from air_runtime.adr_watcher import ADRWatcher
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        adr_dir = Path(tmpdir)
+        adr_file = adr_dir / "ADR-0005-ffmpeg-decode.md"
+        adr_file.write_text("# ADR-0005\n\nStatus: accepted\n\n用 ffmpeg。")
+
+        watcher = ADRWatcher(adr_dir)
+        watcher.snapshot()
+
+        # 修改 ADR 内容
+        adr_file.write_text("# ADR-0005\n\nStatus: accepted\n\n改用 gstreamer。")
+        changes = watcher.detect_changes()
+
+        assert len(changes) == 1
+        assert changes[0].adr_id == "ADR-0005"
+        assert changes[0].kind == "modified"
+        assert changes[0].old_hash != changes[0].new_hash
+
+        print("✓ ADRWatcher 检测修改测试通过")
+    return True
+
+
+def test_adr_watcher_detect_superseded():
+    """测试 ADRWatcher 检测 ADR 被替代"""
+    from air_runtime.adr_watcher import ADRWatcher
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        adr_dir = Path(tmpdir)
+        adr_file = adr_dir / "ADR-0005-ffmpeg-decode.md"
+        adr_file.write_text("# ADR-0005\n\nStatus: accepted\n\n用 ffmpeg。")
+
+        watcher = ADRWatcher(adr_dir)
+        watcher.snapshot()
+
+        # 标记为 superseded
+        adr_file.write_text("# ADR-0005\n\nStatus: superseded\n\n被 ADR-0020 替代。")
+        changes = watcher.detect_changes()
+
+        assert len(changes) == 1
+        assert changes[0].kind == "superseded"
+
+        print("✓ ADRWatcher 检测 superseded 测试通过")
+    return True
+
+
+def test_adr_watcher_detect_new():
+    """测试 ADRWatcher 检测新增 ADR"""
+    from air_runtime.adr_watcher import ADRWatcher
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        adr_dir = Path(tmpdir)
+        (adr_dir / "ADR-0005-old.md").write_text("# ADR-0005\n\nStatus: accepted\n")
+
+        watcher = ADRWatcher(adr_dir)
+        watcher.snapshot()
+
+        # 新增 ADR
+        (adr_dir / "ADR-0020-gstreamer.md").write_text("# ADR-0020\n\nStatus: accepted\n")
+        changes = watcher.detect_changes()
+
+        assert len(changes) == 1
+        assert changes[0].adr_id == "ADR-0020"
+        assert changes[0].kind == "new"
+
+        print("✓ ADRWatcher 检测新增 ADR 测试通过")
+    return True
+
+
+def test_adr_watcher_extract_id():
+    """测试 ADR ID 提取"""
+    from air_runtime.adr_watcher import ADRWatcher
+
+    assert ADRWatcher._extract_adr_id(Path("ADR-0005-ffmpeg-decode.md")) == "ADR-0005"
+    assert ADRWatcher._extract_adr_id(Path("ADR-0012.md")) == "ADR-0012"
+    assert ADRWatcher._extract_adr_id(Path("ADR-9999-super-long-name.md")) == "ADR-9999"
+
+    print("✓ ADR ID 提取测试通过")
+    return True
+
+
+def test_adr_watcher_parse_status():
+    """测试 ADR Status 字段解析"""
+    from air_runtime.adr_watcher import ADRWatcher
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        f1 = Path(tmpdir) / "ADR-0001.md"
+        f1.write_text("# ADR-0001\n\nStatus: accepted\n")
+        assert ADRWatcher._parse_status(f1) == "accepted"
+
+        f2 = Path(tmpdir) / "ADR-0002.md"
+        f2.write_text("# ADR-0002\n\nStatus: superseded\n")
+        assert ADRWatcher._parse_status(f2) == "superseded"
+
+        f3 = Path(tmpdir) / "ADR-0003.md"
+        f3.write_text("# ADR-0003\n\n无 Status 字段\n")
+        assert ADRWatcher._parse_status(f3) == "unknown"
+
+        print("✓ ADR Status 解析测试通过")
+    return True
+
+
+def test_partial_replanner():
+    """测试局部重规划器"""
+    from air_runtime.task_graph import TaskGraph, TaskNode, Edge
+    from air_runtime.partial_replanner import PartialReplanner
+
+    graph = TaskGraph()
+    # 失效的任务
+    graph.add_node(TaskNode(id="T-001", status="INVALIDATED", task="ffmpeg 解码器",
+                            files_dirs="src/decoder.cpp", write_set=["src/decoder.cpp"],
+                            adr_refs=["ADR-0005"]))
+    graph.add_node(TaskNode(id="T-002", status="INVALIDATED", task="ffmpeg 编码器",
+                            files_dirs="src/encoder.cpp", write_set=["src/encoder.cpp"],
+                            adr_refs=["ADR-0005"]))
+    # 稳定的已完成任务
+    graph.add_node(TaskNode(id="T-003", status="DONE", task="UI 界面",
+                            write_set=["src/ui/main.cpp"], adr_refs=["ADR-0008"]))
+    graph.add_node(TaskNode(id="T-004", status="DONE", task="日志模块",
+                            write_set=["src/logger.cpp"], adr_refs=[]))
+
+    replanner = PartialReplanner()
+    delta = replanner.replan(graph, ["T-001", "T-002"])
+
+    # 检查 replan_request 中的受影响上下文
+    request = delta.replan_request
+    assert request["type"] == "partial-replan"
+    assert set(request["invalidatedTaskIds"]) == {"T-001", "T-002"}
+    assert len(request["affectedContext"]) == 2
+    assert request["affectedContext"][0]["task_id"] == "T-001"
+
+    # 检查稳定接口
+    stable = request["stableInterfaces"]
+    assert len(stable) == 2  # T-003 和 T-004
+    stable_ids = {s["task_id"] for s in stable}
+    assert "T-003" in stable_ids
+    assert "T-004" in stable_ids
+
+    print("✓ 局部重规划器测试通过")
+    return True
+
+
+def test_partial_replanner_stable_interfaces():
+    """测试稳定接口提取"""
+    from air_runtime.task_graph import TaskGraph, TaskNode
+    from air_runtime.partial_replanner import PartialReplanner
+
+    graph = TaskGraph()
+    graph.add_node(TaskNode(id="T-001", status="INVALIDATED", task="失效任务", adr_refs=["ADR-0005"]))
+    graph.add_node(TaskNode(id="T-002", status="DONE", task="完成有写集",
+                            write_set=["src/a.cpp", "src/b.cpp"], adr_refs=["ADR-0008"]))
+    graph.add_node(TaskNode(id="T-003", status="DONE", task="完成无写集"))
+    graph.add_node(TaskNode(id="T-004", status="TODO", task="未开始"))
+
+    replanner = PartialReplanner()
+    interfaces = replanner._extract_stable_interfaces(graph, {"T-001"})
+
+    # T-002 有写集，应该包含
+    # T-003 无写集且无 adr_refs，不包含
+    # T-004 不是 DONE，不包含
+    assert len(interfaces) == 1
+    assert interfaces[0].task_id == "T-002"
+
+    print("✓ 稳定接口提取测试通过")
+    return True
+
+
+def test_eng_monitor_detects_adr_change():
+    """测试 Eng 监控循环检测 ADR 变更"""
+    from air_runtime.modes.eng_mode import enter_engine, monitor_engine, _detect_adr_changes
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        project_root = Path(tmpdir)
+
+        # 初始化引擎
+        enter_engine(project_root)
+
+        # 创建 ADR 目录（无文件）
+        adr_dir = project_root / "AirPlan" / "docs" / "architecture" / "adr"
+        adr_dir.mkdir(parents=True, exist_ok=True)
+
+        # 创建初始 ADR
+        (adr_dir / "ADR-0005-ffmpeg.md").write_text("# ADR-0005\n\nStatus: accepted\n\n用 ffmpeg。")
+
+        # 第一次监控：初始化 hash 快照
+        from air_runtime.io import safe_json_load
+        from air_runtime.modes.eng_mode import _paths
+        paths = _paths(project_root)
+        state = safe_json_load(paths["state"]) or {}
+        changes = _detect_adr_changes(project_root, state)
+        assert len(changes) == 0  # 首次只初始化，无变更
+
+        # 保存 hash 到 state
+        from air_runtime.io import atomic_json_write
+        atomic_json_write(paths["state"], state)
+
+        # 修改 ADR 为 superseded
+        (adr_dir / "ADR-0005-ffmpeg.md").write_text("# ADR-0005\n\nStatus: superseded\n\n被替代。")
+
+        # 第二次检测
+        state = safe_json_load(paths["state"]) or {}
+        changes = _detect_adr_changes(project_root, state)
+        assert len(changes) == 1
+        assert changes[0].adr_id == "ADR-0005"
+        assert changes[0].kind == "superseded"
+
+        print("✓ Eng 监控检测 ADR 变更测试通过")
+    return True
+
+
+def test_full_adr_change_to_invalidation_flow():
+    """完整场景：ADR 变更 → 自动检测 → 级联失效 → 局部重规划"""
+    from air_runtime.adr_watcher import ADRWatcher
+    from air_runtime.task_graph import TaskGraph, TaskNode, Edge, PlanDelta
+    from air_runtime.partial_replanner import PartialReplanner
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        project_root = Path(tmpdir)
+        adr_dir = project_root / "docs" / "architecture" / "adr"
+        adr_dir.mkdir(parents=True)
+
+        # 初始 ADR
+        adr_file = adr_dir / "ADR-0005-ffmpeg-decode.md"
+        adr_file.write_text("# ADR-0005\n\nStatus: accepted\n\n使用 ffmpeg 实现视频解码。")
+
+        # 初始化 watcher
+        watcher = ADRWatcher(adr_dir)
+        watcher.snapshot()
+
+        # 初始化 task graph
+        graph = TaskGraph()
+        graph.add_node(TaskNode(id="T-001", status="DONE", task="ffmpeg 解码器",
+                                files_dirs="src/decoder.cpp", write_set=["src/decoder.cpp"],
+                                adr_refs=["ADR-0005"]))
+        graph.add_node(TaskNode(id="T-002", status="TODO", task="解码器集成测试"))
+        graph.add_node(TaskNode(id="T-003", status="DONE", task="UI 界面",
+                                write_set=["src/ui.cpp"], adr_refs=["ADR-0008"]))
+        graph.add_edge(Edge(source="T-001", target="T-002"))
+
+        # 用户修改 ADR（ffmpeg → gstreamer）
+        adr_file.write_text("# ADR-0005\n\nStatus: superseded\n\n改用 gstreamer。")
+
+        # Watcher 检测变更
+        changes = watcher.detect_changes()
+        assert len(changes) == 1
+        assert changes[0].kind == "superseded"
+        assert changes[0].adr_id == "ADR-0005"
+
+        # 触发级联失效
+        delta = PlanDelta()
+        report = graph.invalidate_by_adr("ADR-0005", delta)
+        assert report.invalidated_completed == 1
+        assert report.cascaded_downstream == 1
+        assert graph.dispatch_frozen == True
+
+        # 局部重规划
+        replanner = PartialReplanner()
+        partial_delta = replanner.replan(graph, report.invalidated_task_ids)
+        request = partial_delta.replan_request
+        assert request["type"] == "partial-replan"
+        assert "T-001" in request["invalidatedTaskIds"]
+        assert "T-002" in request["invalidatedTaskIds"]
+        # T-003 是稳定的
+        assert len(request["stableInterfaces"]) == 1
+        assert request["stableInterfaces"][0]["task_id"] == "T-003"
+
+        # 解冻
+        graph.add_node(TaskNode(id="T-101", status="TODO", task="gstreamer 解码器",
+                                files_dirs="src/decoder.cpp", adr_refs=["ADR-0005"]))
+        graph.unfreeze_dispatch()
+        assert graph.dispatch_frozen == False
+
+        print("✓ 完整 ADR 变更流程测试通过（检测→失效→重规划→解冻）")
+    return True
+
+
+def main():
+    print("=" * 50)
+    print("P1-21 补充功能测试：ADRWatcher + PartialReplanner")
+    print("=" * 50)
+
+    tests = [
+        ("ADRWatcher 快照", test_adr_watcher_snapshot),
+        ("ADRWatcher 检测修改", test_adr_watcher_detect_modified),
+        ("ADRWatcher 检测 superseded", test_adr_watcher_detect_superseded),
+        ("ADRWatcher 检测新增", test_adr_watcher_detect_new),
+        ("ADR ID 提取", test_adr_watcher_extract_id),
+        ("ADR Status 解析", test_adr_watcher_parse_status),
+        ("局部重规划器", test_partial_replanner),
+        ("稳定接口提取", test_partial_replanner_stable_interfaces),
+        ("Eng 监控检测 ADR", test_eng_monitor_detects_adr_change),
+        ("完整 ADR 流程", test_full_adr_change_to_invalidation_flow),
+    ]
+
+    passed = 0
+    failed = 0
+
+    for name, test_fn in tests:
+        try:
+            test_fn()
+            passed += 1
+        except Exception as e:
+            print(f"✗ {name} 失败: {e}")
+            import traceback
+            traceback.print_exc()
+            failed += 1
+
+    print("=" * 50)
+    print(f"测试结果: {passed} 通过, {failed} 失败")
+    print("=" * 50)
+
+    return failed == 0
+
+
+if __name__ == "__main__":
+    success = main()
+    sys.exit(0 if success else 1)