diff --git a/README.md b/README.md
index d9be43f..ace205a 100644
--- a/README.md
+++ b/README.md
@@ -282,6 +282,8 @@ print(runtime_diagnostics_dict(diag))  # 可 JSON 序列化
 
 自 **1.2.11** 起，`runtime_diagnostics_dict` 额外包含只读字段 `machine_power`（AC 供电 / 可选 nvidia-smi 限频信息）。探不到则 `probed=false`，**不会**因此把 health 标为 fatal。
 
+自 **1.2.13** 起，提供按 Profile 精准关闭：`ensure_profile_free` / `force_quit_profile_browsers`（只杀命令行含该 `user-data-dir` 的 Chrome/Edge，不碰系统默认浏览器），并可选清理崩溃残留 `SingletonLock`。
+
 ### RPA 有界就绪等待与启动超时（1.2.11+）
 
 ```python
@@ -298,6 +300,20 @@ if result.timed_out:
 # 或环境变量 OPENCLAW_BROWSER_LAUNCH_TIMEOUT_MS=60000
 ```
 
+### RPA Profile 占用释放（1.2.13+）
+
+```python
+from jiangchang_skill_core.rpa import ensure_profile_free, launch_persistent_browser
+from jiangchang_skill_core.rpa.errors import ERR_PROFILE_IN_USE
+
+# 发布前：关掉账号管理「打开浏览器」占用的同一 Profile，再启动
+result = ensure_profile_free(profile_dir)
+# result.pids_before / killed_ops / stale_lock_cleared / freed
+
+# 或在统一启动封装上打开开关（默认 False，保持旧行为）
+# context = await launch_persistent_browser(pw, profile_dir=..., ensure_free=True)
+```
+
 薄错误码（技能自行决定是否 fatal / retryable）：
 
 - `ERROR:UI_NOT_READY`
diff --git a/pyproject.toml b/pyproject.toml
index 1d868e9..a68b3f8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "jiangchang-platform-kit"
-version = "1.2.12"
+version = "1.2.13"
 description = "匠厂平台共享组件:Skill 实体 SDK + 桌面应用自动化 SDK + 桌面 UIA 暖树"
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/src/jiangchang_skill_core/rpa/__init__.py b/src/jiangchang_skill_core/rpa/__init__.py
index b4e5509..b5fcd22 100644
--- a/src/jiangchang_skill_core/rpa/__init__.py
+++ b/src/jiangchang_skill_core/rpa/__init__.py
@@ -14,6 +14,15 @@ try:
 except ImportError:
     RpaVideoSession = None  # type: ignore[misc, assignment]
 
+from .profile_lock import (
+    EnsureProfileFreeResult,
+    clear_stale_singleton_locks,
+    ensure_profile_free,
+    force_quit_profile_browsers,
+    is_profile_lock_error,
+    list_profile_browser_pids,
+    list_profile_browser_root_pids,
+)
 from .wait import PollUntilResult, poll_until, poll_until_sync
 
 __all__ = [
@@ -28,6 +37,13 @@ __all__ = [
     "PollUntilResult",
     "poll_until",
     "poll_until_sync",
+    "EnsureProfileFreeResult",
+    "clear_stale_singleton_locks",
+    "ensure_profile_free",
+    "force_quit_profile_browsers",
+    "is_profile_lock_error",
+    "list_profile_browser_pids",
+    "list_profile_browser_root_pids",
     # re-export common anti_detect helpers
     "random_delay",
     "human_delay_short",
diff --git a/src/jiangchang_skill_core/rpa/browser.py b/src/jiangchang_skill_core/rpa/browser.py
index ccfe0e8..bfce0a2 100644
--- a/src/jiangchang_skill_core/rpa/browser.py
+++ b/src/jiangchang_skill_core/rpa/browser.py
@@ -44,6 +44,7 @@ async def launch_persistent_browser(
     headless: bool | None = None,
     extra_args: list[str] | None = None,
     timeout_ms: int | None = None,
+    ensure_free: bool = False,
 ) -> "BrowserContext":
     """用 stealth 参数启动 persistent context + 注入 STEALTH_INIT_SCRIPT。
 
@@ -54,10 +55,20 @@ async def launch_persistent_browser(
         可选启动超时（毫秒）。为 None 时读 OPENCLAW_BROWSER_LAUNCH_TIMEOUT_MS；
         仍为空则不包裹超时（与历史行为一致）。超时抛 RuntimeError，前缀
         ERROR:BROWSER_START_TIMEOUT。本函数不做自动重试。
+
+    ensure_free:
+        为 True 时，启动前调用 ``ensure_profile_free``：精准关闭占用该
+        Profile 的 Chrome/Edge，并清理崩溃残留 Singleton 锁。默认 False，
+        保持历史行为；发布类技能建议传 True，或自行先调 ensure_profile_free。
     """
     if headless is None:
         headless = config.get_bool("OPENCLAW_BROWSER_HEADLESS", default=False)
 
+    if ensure_free:
+        from .profile_lock import ensure_profile_free
+
+        ensure_profile_free(profile_dir)
+
     chrome = executable_path or find_chrome_executable()
     if not chrome:
         raise RuntimeError(
diff --git a/src/jiangchang_skill_core/rpa/errors.py b/src/jiangchang_skill_core/rpa/errors.py
index 33dfd2d..5929e26 100644
--- a/src/jiangchang_skill_core/rpa/errors.py
+++ b/src/jiangchang_skill_core/rpa/errors.py
@@ -12,6 +12,7 @@ ERR_WINDOW_NOT_FOUND = "ERROR:WINDOW_NOT_FOUND"
 ERR_UI_NOT_READY = "ERROR:UI_NOT_READY"
 ERR_BROWSER_START_TIMEOUT = "ERROR:BROWSER_START_TIMEOUT"
 ERR_ENV_DEGRADED = "ERROR:ENV_DEGRADED"
+ERR_PROFILE_IN_USE = "ERROR:PROFILE_IN_USE"
 
 __all__ = [
     "ERR_REQUIRE_LOGIN",
@@ -24,4 +25,5 @@ __all__ = [
     "ERR_UI_NOT_READY",
     "ERR_BROWSER_START_TIMEOUT",
     "ERR_ENV_DEGRADED",
+    "ERR_PROFILE_IN_USE",
 ]
diff --git a/src/jiangchang_skill_core/rpa/profile_lock.py b/src/jiangchang_skill_core/rpa/profile_lock.py
new file mode 100644
index 0000000..251c62a
--- /dev/null
+++ b/src/jiangchang_skill_core/rpa/profile_lock.py
@@ -0,0 +1,384 @@
+"""按 Chromium Profile（user-data-dir）精准占用检测 / 关闭 / 僵锁清理。
+
+只匹配命令行包含该 Profile 绝对路径的 chrome/msedge，不碰系统默认浏览器。
+供发布类 RPA 在 launch_persistent_context 前调用，避免「账号管理打开浏览器未关」撞锁失败。
+"""
+
+from __future__ import annotations
+
+import base64
+import logging
+import os
+import subprocess
+import sys
+import time
+from dataclasses import dataclass, field
+from typing import Iterable, List, Sequence
+
+from .errors import ERR_PROFILE_IN_USE
+
+_logger = logging.getLogger(__name__)
+
+# 过短路径误匹配面过大（正式账号 Profile 远长于此）
+_MIN_PROFILE_PATH_LEN = 12
+
+_LOCK_HINTS = (
+    "processsingleton",
+    "profile is already in use",
+    "user data directory is already in use",
+    "singletonlock",
+    "browser is already running",
+    "failed to create a processsingleton",
+)
+
+_SINGLETON_NAMES = ("SingletonLock", "SingletonCookie", "SingletonSocket")
+
+
+@dataclass(frozen=True)
+class EnsureProfileFreeResult:
+    """ensure_profile_free 的结构化结果（便于技能打日志）。"""
+
+    profile_dir: str
+    pids_before: tuple[int, ...] = ()
+    killed_ops: int = 0
+    stale_lock_cleared: bool = False
+    pids_after: tuple[int, ...] = ()
+    freed: bool = True
+    notes: tuple[str, ...] = field(default_factory=tuple)
+
+
+def is_profile_lock_error(exc: BaseException) -> bool:
+    """判断异常文案是否像 Chromium Profile 被占用。"""
+    msg = str(exc).lower()
+    return any(n in msg for n in _LOCK_HINTS)
+
+
+def _norm_profile(profile_dir: str) -> str:
+    return os.path.abspath((profile_dir or "").strip())
+
+
+def _profile_path_b64(profile_dir: str) -> str:
+    """UTF-8 Base64，供 PowerShell 解码；避免 -Command 引号/编码弄坏中文路径。"""
+    return base64.b64encode(_norm_profile(profile_dir).encode("utf-8")).decode("ascii")
+
+
+def _ps_decode_profile_path(path_b64: str) -> str:
+    return (
+        "$ErrorActionPreference = 'SilentlyContinue'\n"
+        f"$p = [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String('{path_b64}'))\n"
+        "if (-not $p) { exit 0 }\n"
+    )
+
+
+def _dedupe_pids(pids: Iterable[int]) -> list[int]:
+    seen: set[int] = set()
+    out: list[int] = []
+    for pid in pids:
+        if pid <= 0 or pid in seen:
+            continue
+        seen.add(pid)
+        out.append(pid)
+    return out
+
+
+def list_profile_browser_pids(profile_dir: str) -> list[int]:
+    """查找占用该 user-data-dir 的 chrome/msedge 进程（匹配完整 Profile 路径）。"""
+    profile_abs = _norm_profile(profile_dir)
+    if not profile_abs or len(profile_abs) < _MIN_PROFILE_PATH_LEN:
+        return []
+    if sys.platform == "win32":
+        return _list_pids_win(profile_abs, roots_only=False)
+    return _list_pids_posix(profile_abs, roots_only=False)
+
+
+def list_profile_browser_root_pids(profile_dir: str) -> list[int]:
+    """仅主进程（命令行不含 --type=），便于 taskkill /T 收整棵进程树。"""
+    profile_abs = _norm_profile(profile_dir)
+    if not profile_abs or len(profile_abs) < _MIN_PROFILE_PATH_LEN:
+        return []
+    if sys.platform == "win32":
+        return _list_pids_win(profile_abs, roots_only=True)
+    return _list_pids_posix(profile_abs, roots_only=True)
+
+
+def _list_pids_win(profile_abs: str, *, roots_only: bool) -> list[int]:
+    root_clause = (
+        "$_.CommandLine -notmatch '--type='"
+        if roots_only
+        else "$true"
+    )
+    ps = (
+        _ps_decode_profile_path(_profile_path_b64(profile_abs))
+        + "Get-CimInstance Win32_Process -Filter \"Name='chrome.exe' OR Name='msedge.exe'\" |\n"
+        + "  Where-Object {\n"
+        + "    $_.CommandLine -and\n"
+        + "    $_.CommandLine.Contains($p) -and\n"
+        + f"    ({root_clause})\n"
+        + "  } |\n"
+        + "  ForEach-Object { $_.ProcessId }\n"
+    )
+    try:
+        out = subprocess.check_output(
+            ["powershell", "-NoProfile", "-ExecutionPolicy", "Bypass", "-Command", ps],
+            text=True,
+            encoding="utf-8",
+            errors="replace",
+            timeout=20,
+        )
+        return _dedupe_pids(
+            int(line.strip()) for line in (out or "").splitlines() if line.strip().isdigit()
+        )
+    except Exception:
+        _logger.warning(
+            "profile_pid_scan_failed profile_dir=%s roots_only=%s",
+            profile_abs,
+            roots_only,
+            exc_info=True,
+        )
+        return []
+
+
+def _list_pids_posix(profile_abs: str, *, roots_only: bool) -> list[int]:
+    """尽力而为：扫 chrome/chromium/msedge 命令行。无 psutil 依赖。"""
+    try:
+        out = subprocess.check_output(
+            ["ps", "-ax", "-o", "pid=,command="],
+            text=True,
+            encoding="utf-8",
+            errors="replace",
+            timeout=15,
+        )
+    except Exception:
+        _logger.warning("profile_pid_scan_failed_posix profile_dir=%s", profile_abs, exc_info=True)
+        return []
+    needle = profile_abs
+    names = ("chrome", "chromium", "msedge", "google-chrome")
+    pids: list[int] = []
+    for line in (out or "").splitlines():
+        text = line.strip()
+        if not text:
+            continue
+        parts = text.split(None, 1)
+        if len(parts) < 2:
+            continue
+        try:
+            pid = int(parts[0])
+        except ValueError:
+            continue
+        cmd = parts[1]
+        if needle not in cmd:
+            continue
+        low = cmd.lower()
+        if not any(n in low for n in names):
+            continue
+        if roots_only and "--type=" in cmd:
+            continue
+        pids.append(pid)
+    return _dedupe_pids(pids)
+
+
+def force_quit_profile_browsers(profile_dir: str, *, settle_sec: float = 0.4) -> int:
+    """仅结束命令行包含该 Profile 绝对路径的 Chrome/Edge 进程树。
+
+    返回发起结束的次数（含二次清残留），不表示最终仍占用的进程数。
+    """
+    raw = (profile_dir or "").strip()
+    if not raw:
+        _logger.warning("browser_force_quit_skipped_bad_profile profile_dir=%r", profile_dir)
+        return 0
+    profile_abs = _norm_profile(raw)
+    if len(profile_abs) < _MIN_PROFILE_PATH_LEN:
+        _logger.warning("browser_force_quit_skipped_bad_profile profile_dir=%r", profile_dir)
+        return 0
+
+    killed = 0
+    roots = list_profile_browser_root_pids(profile_abs)
+    targets = roots or list_profile_browser_pids(profile_abs)
+    killed += _kill_pids(targets)
+
+    if settle_sec > 0:
+        time.sleep(settle_sec)
+    leftovers = list_profile_browser_pids(profile_abs)
+    if leftovers:
+        killed += _kill_pids(leftovers, force=True)
+
+    remain = list_profile_browser_pids(profile_abs)
+    _logger.info(
+        "browser_force_quit profile_dir=%s roots=%s killed_ops=%s remain=%s",
+        profile_abs,
+        roots,
+        killed,
+        remain,
+    )
+    return killed
+
+
+def _kill_pids(pids: Sequence[int], *, force: bool = False) -> int:
+    ops = 0
+    for pid in pids:
+        try:
+            if sys.platform == "win32":
+                subprocess.run(
+                    ["taskkill", "/PID", str(pid), "/T", "/F"],
+                    stdout=subprocess.DEVNULL,
+                    stderr=subprocess.DEVNULL,
+                    check=False,
+                )
+            else:
+                os.kill(pid, 9 if force else 15)
+            ops += 1
+        except Exception:
+            _logger.warning("browser_force_quit_pid_failed pid=%s", pid, exc_info=True)
+    return ops
+
+
+def _pid_alive(pid: int) -> bool:
+    if pid <= 0:
+        return False
+    try:
+        if sys.platform == "win32":
+            # 0 信号在 Windows 上不可靠；用 tasklist
+            out = subprocess.check_output(
+                ["tasklist", "/FI", f"PID eq {pid}", "/NH"],
+                text=True,
+                encoding="utf-8",
+                errors="replace",
+                timeout=10,
+            )
+            return str(pid) in (out or "")
+        os.kill(pid, 0)
+        return True
+    except ProcessLookupError:
+        return False
+    except PermissionError:
+        return True
+    except Exception:
+        return False
+
+
+def _parse_singleton_target_pid(lock_path: str) -> int | None:
+    """从 SingletonLock 解析目标 PID（symlink 目标形如 hostname-pid）。"""
+    try:
+        if os.path.islink(lock_path):
+            target = os.readlink(lock_path)
+        else:
+            # Windows 上偶发为普通文件，内容也可能是 hostname-pid
+            with open(lock_path, "rb") as fh:
+                raw = fh.read(256)
+            target = raw.decode("utf-8", errors="ignore").strip()
+            if not target:
+                return None
+        pid_s = target.rsplit("-", 1)[-1].strip()
+        pid = int(pid_s)
+        return pid if pid > 0 else None
+    except (OSError, ValueError):
+        return None
+
+
+def clear_stale_singleton_locks(profile_dir: str) -> bool:
+    """若 Profile 无存活占用进程，清理崩溃残留的 Singleton* 文件。
+
+    有活进程占用时不删。锁指向的 PID 仍存活时也不删。
+    返回是否删除了至少一个文件。
+    """
+    profile_abs = _norm_profile(profile_dir)
+    if not profile_abs or not os.path.isdir(profile_abs):
+        return False
+    if list_profile_browser_pids(profile_abs):
+        return False
+
+    lock_path = os.path.join(profile_abs, "SingletonLock")
+    if os.path.lexists(lock_path):
+        pid = _parse_singleton_target_pid(lock_path)
+        if pid is not None and _pid_alive(pid):
+            # 锁指向的进程仍在，但命令行未必含本路径（少见）——保守不删
+            _logger.info(
+                "singleton_lock_held_by_pid profile_dir=%s pid=%s",
+                profile_abs,
+                pid,
+            )
+            return False
+
+    removed = False
+    for name in _SINGLETON_NAMES:
+        path = os.path.join(profile_abs, name)
+        if not os.path.lexists(path):
+            continue
+        try:
+            os.remove(path)
+            removed = True
+            _logger.info("stale_singleton_removed profile_dir=%s name=%s", profile_abs, name)
+        except OSError:
+            _logger.warning(
+                "stale_singleton_remove_failed profile_dir=%s name=%s",
+                profile_abs,
+                name,
+                exc_info=True,
+            )
+    return removed
+
+
+def ensure_profile_free(
+    profile_dir: str,
+    *,
+    force_quit: bool = True,
+    clear_stale_lock: bool = True,
+    wait_sec: float = 1.0,
+    raise_if_busy: bool = True,
+) -> EnsureProfileFreeResult:
+    """确保指定 Profile 可被 Playwright launch_persistent_context 独占使用。
+
+    默认：精准关闭占用该目录的浏览器 → 清僵锁 → 复查。
+    仍被占用且 raise_if_busy=True 时抛 RuntimeError（前缀 ERROR:PROFILE_IN_USE）。
+    """
+    profile_abs = _norm_profile(profile_dir)
+    notes: List[str] = []
+    if not profile_abs:
+        raise ValueError("profile_dir 不能为空")
+    if len(profile_abs) < _MIN_PROFILE_PATH_LEN:
+        raise ValueError(f"profile_dir 过短，拒绝操作: {profile_abs!r}")
+
+    before = tuple(list_profile_browser_pids(profile_abs))
+    killed_ops = 0
+    if before and force_quit:
+        killed_ops = force_quit_profile_browsers(profile_abs)
+        notes.append(f"force_quit killed_ops={killed_ops}")
+    elif before and not force_quit:
+        notes.append("occupied_skip_quit")
+
+    stale_cleared = False
+    if clear_stale_lock:
+        stale_cleared = clear_stale_singleton_locks(profile_abs)
+        if stale_cleared:
+            notes.append("stale_singleton_cleared")
+
+    if wait_sec > 0:
+        time.sleep(wait_sec)
+
+    after = tuple(list_profile_browser_pids(profile_abs))
+    freed = len(after) == 0
+    result = EnsureProfileFreeResult(
+        profile_dir=profile_abs,
+        pids_before=before,
+        killed_ops=killed_ops,
+        stale_lock_cleared=stale_cleared,
+        pids_after=after,
+        freed=freed,
+        notes=tuple(notes),
+    )
+    _logger.info(
+        "ensure_profile_free profile_dir=%s before=%s after=%s killed_ops=%s "
+        "stale_cleared=%s freed=%s",
+        profile_abs,
+        before,
+        after,
+        killed_ops,
+        stale_cleared,
+        freed,
+    )
+    if not freed and raise_if_busy:
+        raise RuntimeError(
+            f"{ERR_PROFILE_IN_USE} 账号浏览器配置目录仍被占用（pids={list(after)}）："
+            f"{profile_abs}。请关闭账号管理打开的对应窗口后重试。"
+        )
+    return result
diff --git a/tests/test_profile_lock.py b/tests/test_profile_lock.py
new file mode 100644
index 0000000..555949b
--- /dev/null
+++ b/tests/test_profile_lock.py
@@ -0,0 +1,134 @@
+# -*- coding: utf-8 -*-
+"""Profile 精准关闭 / 僵锁清理单元测试。"""
+from __future__ import annotations
+
+import os
+import tempfile
+import unittest
+from pathlib import Path
+from unittest import mock
+
+from jiangchang_skill_core.rpa.errors import ERR_PROFILE_IN_USE
+from jiangchang_skill_core.rpa.profile_lock import (
+    clear_stale_singleton_locks,
+    ensure_profile_free,
+    force_quit_profile_browsers,
+    is_profile_lock_error,
+)
+
+
+class TestProfileLockHelpers(unittest.TestCase):
+    def test_is_profile_lock_error(self) -> None:
+        self.assertTrue(
+            is_profile_lock_error(
+                RuntimeError("User data directory is already in use")
+            )
+        )
+        self.assertTrue(is_profile_lock_error(RuntimeError("SingletonLock")))
+        self.assertFalse(is_profile_lock_error(RuntimeError("timeout waiting")))
+
+    def test_force_quit_rejects_short_path(self) -> None:
+        self.assertEqual(force_quit_profile_browsers("C:\\a"), 0)
+
+    def test_clear_stale_singleton_when_no_pids(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            profile = Path(tmp) / "account-manager" / "profiles" / "acc-1"
+            profile.mkdir(parents=True)
+            lock = profile / "SingletonLock"
+            cookie = profile / "SingletonCookie"
+            lock.write_text("deadhost-999999", encoding="utf-8")
+            cookie.write_text("x", encoding="utf-8")
+            with mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.list_profile_browser_pids",
+                return_value=[],
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock._pid_alive",
+                return_value=False,
+            ):
+                removed = clear_stale_singleton_locks(str(profile))
+            self.assertTrue(removed)
+            self.assertFalse(lock.exists())
+            self.assertFalse(cookie.exists())
+
+    def test_clear_stale_skips_when_pids_present(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            profile = Path(tmp) / "profiles" / "acc-2"
+            profile.mkdir(parents=True)
+            lock = profile / "SingletonLock"
+            lock.write_text("host-1", encoding="utf-8")
+            with mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.list_profile_browser_pids",
+                return_value=[1234],
+            ):
+                removed = clear_stale_singleton_locks(str(profile))
+            self.assertFalse(removed)
+            self.assertTrue(lock.exists())
+
+    def test_ensure_profile_free_quits_then_ok(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            profile = Path(tmp) / "profiles" / "acc-long-enough"
+            profile.mkdir(parents=True)
+            with mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.list_profile_browser_pids",
+                side_effect=[[111], []],
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.force_quit_profile_browsers",
+                return_value=1,
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.clear_stale_singleton_locks",
+                return_value=False,
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.time.sleep",
+            ):
+                result = ensure_profile_free(
+                    str(profile), wait_sec=0, raise_if_busy=True
+                )
+            self.assertTrue(result.freed)
+            self.assertEqual(result.pids_before, (111,))
+            self.assertEqual(result.pids_after, ())
+            self.assertEqual(result.killed_ops, 1)
+
+    def test_ensure_profile_free_raises_when_still_busy(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            profile = Path(tmp) / "profiles" / "acc-still-busy"
+            profile.mkdir(parents=True)
+            with mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.list_profile_browser_pids",
+                return_value=[222],
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.force_quit_profile_browsers",
+                return_value=1,
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.clear_stale_singleton_locks",
+                return_value=False,
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.time.sleep",
+            ):
+                with self.assertRaises(RuntimeError) as ctx:
+                    ensure_profile_free(str(profile), wait_sec=0, raise_if_busy=True)
+            self.assertIn(ERR_PROFILE_IN_USE, str(ctx.exception))
+
+    def test_ensure_profile_free_no_raise_when_requested(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            profile = Path(tmp) / "profiles" / "acc-keep-busy"
+            profile.mkdir(parents=True)
+            with mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.list_profile_browser_pids",
+                return_value=[333],
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.force_quit_profile_browsers",
+                return_value=0,
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.clear_stale_singleton_locks",
+                return_value=False,
+            ), mock.patch(
+                "jiangchang_skill_core.rpa.profile_lock.time.sleep",
+            ):
+                result = ensure_profile_free(
+                    str(profile), wait_sec=0, raise_if_busy=False
+                )
+            self.assertFalse(result.freed)
+
+
+if __name__ == "__main__":
+    unittest.main()