chore: cleanup dead props, deps, dirs, and stale comments

- Remove empty dirs: modules/mana/, modules/subscription/, and 7
  empty route dirs (spiral, profile, themes, help, apps, mana, credits)
- Remove @mana/subscriptions from web app dependencies (never imported)
- PillNavigation: drop settingsHref, manaHref, allAppsHref/allAppsLabel
  props + their link-builder blocks (none are passed anymore; all system
  pages route via /?app=<id> deep-links now)
- Update layout comment to reflect current architecture

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/mana/apps/web/package.json

@@ -73,7 +73,6 @@
 		"@mana/shared-uload": "workspace:*",
 		"@mana/shared-utils": "workspace:*",
 		"@mana/spiral-db": "workspace:*",
-		"@mana/subscriptions": "workspace:*",
 		"@mana/wallpaper-generator": "workspace:*",
 		"@types/pako": "^2.0.4",
 		"@types/suncalc": "^1.9.2",

apps/mana/apps/web/src/routes/(app)/+layout.svelte

@@ -302,11 +302,10 @@
 	}
 
 	// ── Navigation ──────────────────────────────────────────
-	// Note: spiral, credits, profile and settings used to live here as
-	// standalone pills but were moved into the user-menu dropdown so the
-	// nav stays compact. They are still routable via the dropdown items
-	// the layout passes as `spiralHref` / `creditsHref` / `profileHref` /
-	// `settingsHref` below.
+	// System pages (spiral, credits, profile, themes, help) are workbench
+	// apps now — no standalone routes. The user-menu dropdown links via
+	// `spiralHref` / `creditsHref` / `profileHref` etc., all pointing to
+	// `/?app=<id>` deep-links.
 	let baseNavItems = $derived<PillNavItem[]>([
 		{
 			href: '/',
@@ -581,6 +580,13 @@
 		// sync engine boot on the critical path.
 		if (authStore.isAuthenticated) {
 			setErrorTrackingUser({ id: authStore.user?.id ?? 'unknown', email: authStore.user?.email });
+			// Multi-Agent Workbench (Phase 1): bind the real user identity
+			// to the ambient Actor so subsequent writes stamp principalId +
+			// displayName correctly instead of 'legacy:user' / 'Du'.
+			const { bindDefaultUser } = await import('$lib/data/events/actor');
+			const uid = authStore.user?.id ?? 'unknown';
+			const name = authStore.user?.name || authStore.user?.email || 'Du';
+			bindDefaultUser(uid, name);
 			await syncBilling.load();
 			const getToken = () => authStore.getValidToken();
 			unifiedSync = createUnifiedSync(SYNC_SERVER_URL, getToken, syncBilling.active);