Add Google Calendar connector (gcal)
- connector.json: OAuth Google, scope https://www.googleapis.com/auth/calendar
deliver: file/google_authorized_user → {secrets}/google_creds.json
mcp_config.env.GOOGLE_CREDS_PATH = {secrets}/google_creds.json
- verify.py: loads creds + API probe (calendarList.list)
- gcal_mcp_server.py: 8 tools (status, list_calendars, list_events,
get_event, create_event, update_event, delete_event, respond_to_event)
+ push notification polling
- icons: calendar SVG (48px + 96px)
- connectors.json index: gcal entry with auth + sha256
- SKALD.md: tabella connector + stato verify aggiornati