simplify(compat): hermes_state — drop 81 re-exports + 3 registry aliases + 3 shims, repoint 45 callers + 60 test files

hermes_state.py: delete every '# noqa: F401 (re-exported...)' import block (hermes_state_common/errors/guard/
readpool/sessions/fts/dbfile/wal/repair/registry + agent.context_compressor _DB_PERSISTED_MARKER_KEY); keep
only the names hermes_state.py itself uses, without noqa.
hermes_state_registry.py: drop get_shared_session_db/release_shared_session_db/close_shared_session_dbs
aliases; every caller (gateway/, tools/, tui_gateway/, cron/, mcp_serve, run_agent, tests) now imports
acquire/release/close_all/release_or_close from hermes_state_registry.
hermes_state_titles.py: drop set_auto_title_if_empty shim (title_generator keeps its getattr fallback).
Re-remove shim-only names restored by 34abf954bd: latest_user_message_row_id (tests call
latest_message_row_id(key, role='user'); role-targeting assertions kept) and get_session_activity (tests
build the snapshot via agent.session_activity.build_activity_snapshot over db.get_session(sid)).
hermes_state_wal._log_once resolves its dedupe sets as module globals instead of via hermes_state;
hermes_state_repair helpers call module globals directly (tests patch hermes_state_repair.<name>).
Frozen updater surface untouched (update_cmd_maint imports only SessionDB from hermes_state).

hermes_state_titles.py

@@ -127,10 +127,6 @@ class SessionTitlesMixin:
             raise ValueError(f"invalid automatic title source: {source!r}")
         return self._set_session_title(session_id, title, source=source)
 
-    def set_auto_title_if_empty(self, session_id: str, title: str) -> bool:
-        """Back-compat shim (third-party plugins reference it by name)."""
-        return self.set_auto_title(session_id, title, source=self.TITLE_SOURCE_LLM)
-
     def get_session_title(self, session_id: str) -> Optional[str]:
         """Get the title for a session, or None."""
         row = self._read_one("SELECT title FROM sessions WHERE id = ?", (session_id,))