The user activity feed only returns events from the user's own namespace. This adds org discovery via /api/v1/user/orgs and polls each org's activity feed, filtering for events by the configured user. Per-org poller state keys enable independent backfill. Org feed errors are non-fatal to avoid disrupting the user feed poll. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>