feat(system): feat(windows): cherry-pick Windows parity fixes from #328 — watchdog ctypes (#323), dispatch monitor projects dir encoding (#324), prax atomic_write retry on PermissionError (#325), prax _WindowsSafeRotatingHandler (#318), branch_detector forward-slash normalize, memory_bank config seed (#322), PS profile wrapper (#319/#340). All Windows-only branches or no-op on Linux. 3146 tests pass, ruff zero. Closes #328 scope. Input-X credit preserved. (#342)

Co-authored-by: @devpulse <devpulse@aipass>

src/aipass/devpulse/apps/handlers/watchdog/agent.py

@@ -89,8 +89,42 @@ def _is_zombie_linux(pid: int) -> bool:
     return False
 
 
+def _pid_alive_windows(pid: int) -> bool:
+    """Windows-safe liveness check via OpenProcess + GetExitCodeProcess."""
+    import ctypes
+    from ctypes import wintypes
+
+    PROCESS_QUERY_LIMITED_INFORMATION = 0x1000
+    STILL_ACTIVE = 259
+
+    kernel32 = ctypes.windll.kernel32  # type: ignore[attr-defined]  # Windows-only
+    kernel32.OpenProcess.argtypes = [wintypes.DWORD, wintypes.BOOL, wintypes.DWORD]
+    kernel32.OpenProcess.restype = wintypes.HANDLE
+    kernel32.GetExitCodeProcess.argtypes = [wintypes.HANDLE, ctypes.POINTER(wintypes.DWORD)]
+    kernel32.GetExitCodeProcess.restype = wintypes.BOOL
+    kernel32.CloseHandle.argtypes = [wintypes.HANDLE]
+    kernel32.CloseHandle.restype = wintypes.BOOL
+
+    handle = kernel32.OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, False, pid)
+    if not handle:
+        return False
+    try:
+        exit_code = wintypes.DWORD()
+        if not kernel32.GetExitCodeProcess(handle, ctypes.byref(exit_code)):
+            return False
+        return exit_code.value == STILL_ACTIVE
+    finally:
+        kernel32.CloseHandle(handle)
+
+
 def _pid_alive(pid: int) -> bool:
     """Return True if the process is alive (not zombie)."""
+    if sys.platform == "win32":
+        try:
+            return _pid_alive_windows(pid)
+        except Exception as exc:
+            logger.info("[watchdog.agent] PID %s Windows check failed (assuming alive): %s", pid, exc)
+            return True
     try:
         os.kill(pid, 0)
     except ProcessLookupError as exc:
@@ -99,6 +133,9 @@ def _pid_alive(pid: int) -> bool:
     except PermissionError as exc:
         logger.info("[watchdog.agent] PID %s permission denied (alive): %s", pid, exc)
         return True
+    except OSError as exc:
+        logger.info("[watchdog.agent] PID %s os.kill error (assuming dead): %s", pid, exc)
+        return False
     if sys.platform == "linux" and _is_zombie_linux(pid):
         return False
     return True