desktop+gateway: harden Slack socket recovery and Windows restart dedupe (#28873)

* desktop+gateway: harden Slack socket recovery and Windows restart dedupe

Fix Slack Socket Mode reliability by adding a watchdog/reconnect path so silent socket task drops no longer leave the adapter stuck. Harden Windows gateway lifecycle by avoiding desktop-binary path collisions, making gateway PID scans case/extension tolerant, and reusing in-flight restart actions to prevent duplicate gateway spawns.

* test(slack): add Socket Mode watchdog/reconnect behavioural coverage

Drive the new Slack Socket Mode self-healing logic through a fake AsyncSocketModeHandler so we can simulate the P0 silent-hang failure mode (task exit, transport disconnected, intentional shutdown, concurrent reconnect attempts) without touching real Slack.

* fix(slack,desktop): address Copilot review on watchdog races and path normalization

- connect(): explicitly cancel + await the prior socket watchdog before flipping _running, so an old monitor cannot exit between teardown and respawn (Copilot #1)
- _socket_watchdog_loop: wrap the body in try/except + add a done-callback that respawns on unexpected crash, so a transient bug cannot permanently disable self-healing (Copilot #2)
- normalizeExecutablePathForCompare: use the resolved path for realpathSync so non-string inputs cannot leak through (Copilot #3)
- Add tests for crash-recovery and atomic watchdog replacement across reconnects

* fix(slack): tighten connect() error path and clarify watchdog test intent

Address Copilot review round 2.

- connect(): wrap _start_socket_mode_handler/_ensure_socket_watchdog in a focused try/except so any failure rolls back partially-started handler/task state and leaves _running=False, ensuring the platform lock is always released by the outer finally
- Defer _running=True until after the handler is actually started so the watchdog observes a live socket task immediately and never spins against a half-built adapter
- Rename test_watchdog_self_restarts_after_unexpected_crash to test_watchdog_cancellation_does_not_respawn (matches what it actually asserts) and add test_watchdog_unexpected_exit_respawns_via_done_callback that drives a real RuntimeError through _on_socket_watchdog_done and verifies a fresh task replaces the crashed one

* fix(web_server): serialize action spawn check+store under a threading lock

Address Copilot review round 3.

FastAPI runs sync handlers on its threadpool, so two near-simultaneous /api/gateway/restart (or /api/hermes/update) requests could both observe "no live process" in _spawn_hermes_action's poll-based dedupe and double-spawn. Add a module-level _ACTION_SPAWN_LOCK around the entire check + Popen + _ACTION_PROCS store sequence so the dedupe is atomic across threads.

* fix: address Copilot review round 4

- slack.disconnect(): mirror connect()'s defensive cleanup — catch the broad Exception path on watchdog await so handler shutdown and lock release still run if the watchdog raised before cancellation took effect
- web_server._spawn_hermes_action: wrap subprocess.Popen in try/except so a missing executable / permission error closes the log file handle, writes a failure marker, and re-raises instead of leaking a file descriptor
- gateway._scan_gateway_pids: drop the over-broad "hermes.exe --profile" / "hermes.exe -p" patterns that would match any Hermes CLI subcommand using a profile flag (e.g. `hermes.exe --profile foo dashboard`); rely on the "hermes.exe gateway" + "hermes-gateway.exe" tokens instead
- tests: tighten _fake_create_task to assert coroutine input and return a real asyncio.Task that stays pending until pytest teardown, and update the three callsites whose mocked AsyncSocketModeHandler.start_async returned a non-coroutine value

* fix(slack): reset multi-workspace state on reconnect

Address Copilot review round 5.

connect() is reentrant (gateway restart, in-process reconnect), but it was leaving _bot_user_id / _team_clients / _team_bot_user_ids populated from the previous session. A reconnect that rotated the primary token or dropped a workspace would silently keep the stale bot user id and stale workspace client maps, leading to dispatch against gone workspaces.

Clear these three pieces of state right after _stop_socket_mode_handler() and before the auth_test loop, then let the loop repopulate from the current tokens. Add test_reconnect_refreshes_multi_workspace_state to lock it in.

tests/hermes_cli/test_gateway.py

@@ -442,6 +442,28 @@ def test_find_gateway_pids_falls_back_to_pid_file_when_process_scan_fails(monkey
     assert gateway.find_gateway_pids() == [321]
 
 
+def test_scan_gateway_pids_detects_windows_hermes_exe_case_variants(monkeypatch):
+    monkeypatch.setattr(gateway, "is_windows", lambda: True)
+    monkeypatch.setattr(gateway, "_get_ancestor_pids", lambda: set())
+    monkeypatch.setattr(gateway.shutil, "which", lambda name: "wmic.exe" if name == "wmic" else None)
+
+    def fake_run(cmd, **kwargs):
+        if cmd[:4] == ["wmic.exe", "process", "get", "ProcessId,CommandLine"]:
+            return SimpleNamespace(
+                returncode=0,
+                stdout=(
+                    "CommandLine=C:\\Program Files\\Hermes\\Hermes.EXE gateway run --replace\n"
+                    "ProcessId=2468\n\n"
+                ),
+                stderr="",
+            )
+        raise AssertionError(f"Unexpected command: {cmd}")
+
+    monkeypatch.setattr(gateway.subprocess, "run", fake_run)
+
+    assert gateway._scan_gateway_pids(set(), all_profiles=True) == [2468]
+
+
 # ---------------------------------------------------------------------------
 # _wait_for_gateway_exit
 # ---------------------------------------------------------------------------