Add test client and automated integration test suite
- 'test' OAuth client maps to stefan's data via USER_ALIASES
- 38 tests covering OAuth (metadata, client_credentials, PKCE, invalid
secret, no auth), Mail (accounts, folders, search), Calendar
(calendars, tasks, events, search), Contacts (search, empty),
Files (list, info), Notes (notebooks)
- Daily systemd timer (05:00) with NTFY notification on failure
- Shared token store (.active_tokens.json) for cross-process auth
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Stefan Lohmaier
2618ecfc86