feat(mcp): P3 联机验证通过，新增 browser_open_form 断点续填，修 4 个联机才暴露的真 bug

联机跑通 open→login→new_form→fill(basic)→page_state→close：财务系统真的落库（单据编号 202610020850，
basic 页点「下一步」即保存）。据此补上续填能力并把测试草稿清理干净（删除前后截图 + 复查 0 命中）。

- 新增第 25 个工具 browser_open_form：列表页 #seacher 定位 → 唯一命中 → 行内单选 → #update 修改，
  读回 #EXPENEXPLAIN 证明数据还在；preview_only 只定位不点开并回显 bill_no/state/amount；
  命中多张直接拒绝并回 candidates，不替用户猜单据
- 修 4 个真 bug（都是单元测试看不见的）：
  1) navigate_to_reimburse 单点硬等 5 秒偶发超时 → 全程轮询 + 失败带页面文字与截图；
     并查明直达报销 URL 不建立会话（会被踢「长时间未操作，请重新登录!」），门户点击链是必经
  2) actor.close_all 用 atexit 注册无效：concurrent.futures.thread 的钩子走 threading._register_atexit，
     比 atexit 早跑，executor 已 shutdown → close 提交不进去。改为注册到同一列表，实测 close
     在 playwright_0 线程执行，退出不再漏浏览器
  3) wait_rows_loaded 只认 <a>，真实「查看」是 <button>，每次白等满 20 秒（也拖慢了测试套件）
  4) 空结果「没有找到匹配的记录」被当成加载中，搜不到时再白等 20 秒
- browser_page_state 语义修正：logged_in 判门户 URL，进报销系统后必然 false 会误导 → 拆成
  at_portal / in_reimburse_system / on_form_page
- case_status 补齐 info_both / screenshots / browser（锁持有者与心跳年龄）/ warnings（混合 info、
  陈旧抽取、他人持锁）；.browser.lock 文件名由 cases.py 单一定义，actor 反向引用
- 列表页结构实测写进 AGENTS：btSelectItem 单选、#insert/#update/#delete、行内「查看」是 gzlc 流程图、
  可见搜索框是 #seacher 而 #expenexplain 在收起面板（fill 会卡 30 秒）
- 测试：FakeBot 绑 BaseBot 真实行逻辑，新增 5 例续填用例（唯一命中/歧义拒绝/未命中/preview/空关键词），
  134 passed 0.36s；文档 docs/MCP.md 工具参考按 wire schema 重生成（25 工具），SKILL 增「断了不要重来，
  用 browser_open_form 续填」与破坏性操作纪律；方案文档 §13.5 记录联机结果、4 个 bug 与未完成项

验证：mcp_smoke 25 工具 / ruff / format / mypy / deptry / pytest 134 passed 全绿；
联机时间线见方案文档 §13.5。仍用 --no-verify 提交并手跑等价检查（原因见 AGENTS 提交纪律）。

tests/test_mcp_browser.py

@@ -25,9 +25,27 @@ class FakePage:
         self._existing = existing or set()
         self.calls: list[Any] = []
         self.url = "http://sso.test/login"
+        self.rows: list[Any] = []
+        self.loading_text = ""
+        self.update_clicks = 0
 
-    def query_selector(self, selector: str) -> object | None:
-        return object() if selector in self._existing else None
+    def query_selector(self, selector: str) -> FakeCell | None:
+        if selector == "#seacher":
+            return FakeCell("")
+        if selector == "#update":
+            return FakeCell("", page=self)
+        # 已知选择器要返回带 input_value 之类的元素，不能返回裸 object()
+        return FakeCell("已填内容") if selector in self._existing else None
+
+    def query_selector_all(self, selector: str) -> list[Any]:
+        if selector == "#table tr":
+            return list(self.rows)
+        return []
+
+    def inner_text(self, selector: str = "", timeout: int | None = None) -> str:
+        if selector == "#table":
+            return self.loading_text
+        return ""
 
     def title(self) -> str:
         return "统一认证"
@@ -45,6 +63,53 @@ class FakePage:
         return _record
 
 
+class FakeRow:
+    """列表页的一行：文本 + 行内单选框（财务系统用的是 btSelectItem 单选，不是复选）。"""
+
+    def __init__(self, text: str, has_radio: bool = True) -> None:
+        self._text = text
+        self._has_radio = has_radio
+        self.radio_clicks = 0
+
+    def inner_text(self) -> str:
+        return self._text
+
+    def query_selector_all(self, selector: str) -> list[FakeCell]:
+        return [FakeCell(part) for part in self._text.split(" | ")]
+
+    def query_selector(self, selector: str) -> FakeCell | None:
+        if selector.startswith("input[") and self._has_radio:
+            return FakeCell("", radio_of=self)
+        return None
+
+
+class FakeCell:
+    def __init__(self, text: str, radio_of: Any = None, page: Any = None) -> None:
+        self._text = text
+        self._radio_of = radio_of
+        self._page = page
+        self.clicks = 0
+
+    def inner_text(self) -> str:
+        return self._text
+
+    def input_value(self) -> str:
+        return self._text
+
+    def click(self) -> None:
+        self.clicks += 1
+        if self._radio_of is not None:
+            self._radio_of.radio_clicks += 1
+        if self._page is not None:
+            self._page.update_clicks += 1
+
+    def __getattr__(self, name: str) -> Any:
+        def _noop(*args: Any, **kwargs: Any) -> None:
+            return None
+
+        return _noop
+
+
 class FakeBot:
     """只实现工具真正依赖的接口，行为由构造参数决定。"""
 
@@ -108,6 +173,25 @@ class FakeBot:
         self.closed = True
 
 
+# 列表页行逻辑直接用 BaseBot 的真实实现来测（只依赖 page 对象，不需要 Playwright）
+from src.infra.browser.base import BaseBot  # noqa: E402
+
+FakeBot.row_is_ready = BaseBot.row_is_ready  # type: ignore[method-assign]
+FakeBot._wait_any = BaseBot._wait_any  # type: ignore[method-assign]
+FakeBot.row_cells = BaseBot.row_cells  # type: ignore[method-assign]
+FakeBot.row_summary = BaseBot.row_summary  # type: ignore[method-assign]
+FakeBot.find_rows = BaseBot.find_rows  # type: ignore[method-assign]
+FakeBot._rows = BaseBot._rows  # type: ignore[method-assign]
+FakeBot.ROW_ACTIONABLE = BaseBot.ROW_ACTIONABLE
+FakeBot._table_text = BaseBot._table_text  # type: ignore[method-assign]
+FakeBot._rows_loading = BaseBot._rows_loading  # type: ignore[method-assign]
+FakeBot.wait_rows_loaded = BaseBot.wait_rows_loaded  # type: ignore[method-assign]
+FakeBot.search_forms = BaseBot.search_forms  # type: ignore[method-assign]
+FakeBot.list_forms = BaseBot.list_forms  # type: ignore[method-assign]
+FakeBot.open_form = BaseBot.open_form  # type: ignore[method-assign]
+FakeBot.navigate_to_reimburse = lambda self, page_key="reimburse_page": self.navigated.append(page_key)  # type: ignore[assignment]
+
+
 class FakeStore:
     """让工具以为 case_id 指向 tmp 目录。"""
 
@@ -271,6 +355,9 @@ def test_fill_walks_steps_and_reports_remaining(env: dict[str, Any]) -> None:
     assert state["ok"] is True
     assert state["steps_done"] == ["basic", "details", "payment"]
     assert state["markers"]["支付页"] is True
+    assert state["on_form_page"] is True
+    assert state["at_portal"] is True
+    assert state["in_reimburse_system"] is False
     assert state["recent_screenshots"]
 
 
@@ -325,3 +412,70 @@ def test_steps_lists_both_flows_then_one(env: dict[str, Any]) -> None:
     picked = browser.browser_steps(env["id"])
     assert picked["kind"] == "travel"
     assert [s["step"] for s in picked["steps"]] == ["basic", "details", "payment", "subsidy", "attachments"]
+
+
+def _rows_with(texts: list[str]) -> list[FakeRow]:
+    header = FakeRow("查看单据 | 状态 | 报销说明", has_radio=False)
+    return [header] + [FakeRow(x) for x in texts]
+
+
+DRAFT = "查看 | 未提交 | 202610020850 | 2026-10-20 | 元器件采购（MCP 实机填充） | 0.00 | 物理与电子工程学院 | 教学经费"
+
+
+def test_open_form_resumes_unique_hit(env: dict[str, Any]) -> None:
+    _write_info(env, "normal", {})
+    bot = _open(env, portal=True)
+    bot.page.rows = _rows_with([DRAFT])
+    result = browser.browser_open_form(env["id"], "元器件采购")
+    assert result["ok"] is True, result
+    assert result["resumed"] is True
+    assert result["bill_no"] == "202610020850"
+    assert result["state"] == "未提交"
+    assert result["amount"] == "0.00"
+    assert bot.navigated == ["reimburse_page"]
+    assert bot.page.rows[1].radio_clicks == 1
+    assert bot.page.update_clicks == 1
+    assert "browser_page_state" in result["next_action"]
+
+
+def test_open_form_refuses_ambiguous_match(env: dict[str, Any]) -> None:
+    _write_info(env, "normal", {})
+    bot = _open(env, portal=True)
+    bot.page.rows = _rows_with(
+        ["查看 | 未提交 | 202610020001 | 元器件采购 甲 | 1.00", "查看 | 未提交 | 202610020002 | 元器件采购 乙 | 2.00"]
+    )
+    result = browser.browser_open_form(env["id"], "元器件采购")
+    assert result["ok"] is False
+    assert "命中 2 张" in result["reason"]
+    assert "收紧" in result["next_action"]
+    assert bot.page.update_clicks == 0
+    assert all(row.radio_clicks == 0 for row in bot.page.rows)
+    assert len(result["detail"]["candidates"]) == 2
+
+
+def test_open_form_no_match_mentions_date_range(env: dict[str, Any]) -> None:
+    _write_info(env, "normal", {})
+    bot = _open(env, portal=True)
+    bot.page.rows = _rows_with(["查看 | 已提交 | 202609020003 | 别的单据 | 3.00"])
+    result = browser.browser_open_form(env["id"], "元器件采购")
+    assert result["ok"] is False
+    assert "近三个月" in result["next_action"]
+    assert bot.page.update_clicks == 0
+
+
+def test_open_form_preview_clicks_nothing(env: dict[str, Any]) -> None:
+    _write_info(env, "normal", {})
+    bot = _open(env, portal=True)
+    bot.page.rows = _rows_with([DRAFT])
+    result = browser.browser_open_form(env["id"], "元器件采购", preview_only=True)
+    assert result["ok"] and result["preview"] is True
+    assert result["bill_no"] == "202610020850"
+    assert bot.page.update_clicks == 0
+    assert all(row.radio_clicks == 0 for row in bot.page.rows)
+
+
+def test_open_form_requires_keyword(env: dict[str, Any]) -> None:
+    _open(env, portal=True)
+    result = browser.browser_open_form(env["id"], "   ")
+    assert result["ok"] is False
+    assert "match" in result["reason"]