Three bugs found during review:
1. Class is SessionDB not HermesState -- would silently no-op on every install
2. SessionDB.__init__ takes Path not str -- would crash with AttributeError
3. _execute_write() takes a callable not SQL+params -- wrong signature.
Replaced with public set_session_title() API.
4. Each call opened a persistent SQLite connection and never closed it.
Added try/finally db.close() to prevent WAL leak under sustained load.
Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
c312dd36ca