test(tui): launch-handle pin test opens a real registry SessionDB

The salvaged #102534 test patched hermes_state.get_shared_session_db, a seam
main dropped (server._get_db now calls hermes_state_registry.acquire), so the
fixture errored at setup and the file reported 0 passed. Assert on the real
handle's db_path and on the foreign home staying untouched instead of on a
fake factory; red with the pin reverted, green with it.

tests/tui_gateway/test_launch_db_home_override_race.py

@@ -9,11 +9,9 @@ backend permanently serves the wrong profile's state.db.
 
 from __future__ import annotations
 
-from pathlib import Path
-from types import SimpleNamespace
-
 import pytest
 
+import hermes_state_registry as registry
 from hermes_constants import reset_hermes_home_override, set_hermes_home_override
 from tui_gateway import server
 
@@ -29,24 +27,20 @@ def launch_db_env(monkeypatch, tmp_path):
     monkeypatch.setattr(server, "_hermes_home", str(launch_home))
     monkeypatch.setattr(server, "_db", None)
     monkeypatch.setattr(server, "_db_error", None)
-
-    captured: list[Path | None] = []
-
-    def _factory(db_path=None, **_kwargs):
-        captured.append(Path(db_path) if db_path is not None else None)
-        return SimpleNamespace(db_path=db_path)
-
-    monkeypatch.setattr("hermes_state.get_shared_session_db", _factory)
-    return launch_home, foreign_home, captured
+    try:
+        yield launch_home, foreign_home
+    finally:
+        registry.close_all()
 
 
 def test_get_db_first_touch_under_foreign_override_uses_launch_path(launch_db_env):
-    launch_home, foreign_home, captured = launch_db_env
+    launch_home, foreign_home = launch_db_env
     token = set_hermes_home_override(str(foreign_home))
     try:
         db = server._get_db()
         assert db is not None
-        assert captured == [launch_home / "state.db"]
+        assert db.db_path.resolve() == (launch_home / "state.db").resolve()
+        assert not (foreign_home / "state.db").exists()
         assert server._get_db() is db
     finally:
         reset_hermes_home_override(token)