feat(panel-taxonomy): track Faz 2 sase.tr events (page_visibility, idle, shortcuts, referrals, settings, bulk)

7 new event names added to TRACKED_EVENTS so enrich.ts fetches them for compression
timeline interleaving + tagger context. No new tag rules yet (Faz 2 is enrichment,
not signal extraction).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/worker/src/lib/event-taxonomy.ts

@@ -100,6 +100,15 @@ export const TRACKED_EVENTS: string[] = [
   "user_signed_up",
   "user_logged_in",
   "user_logged_out",
+
+  // Faz 2 — optimization / engagement / discovery
+  "page_visibility_changed",
+  "long_idle_detected",
+  "keyboard_shortcut_used",
+  "bulk_action_initiated",
+  "settings_changed",
+  "shared_link_opened",
+  "search_engine_referral",
 ];
 
 export type CanonicalEvent = {