refactor(semantics): migrate legacy @TIER to @COMPLEXITY annotations

- Replaced @TIER: TRIVIAL with @COMPLEXITY: 1
- Replaced @TIER: STANDARD with @COMPLEXITY: 3
- Replaced @TIER: CRITICAL with @COMPLEXITY: 5
- Manually elevated specific critical/complex components to levels 2 and 4
- Ignored legacy, specs, and node_modules directories
- Updated generated semantic map

frontend/src/lib/auth/__tests__/permissions.test.js

@@ -1,5 +1,5 @@
 // [DEF:frontend.src.lib.auth.__tests__.permissions:Module]
-// @TIER: STANDARD
+// @COMPLEXITY: 3
 // @SEMANTICS: tests, auth, permissions, rbac
 // @PURPOSE: Verifies frontend RBAC permission parsing and access checks.
 // @LAYER: UI (Tests)

frontend/src/lib/auth/permissions.js

@@ -1,5 +1,5 @@
 // [DEF:frontend.src.lib.auth.permissions:Module]
-// @TIER: STANDARD
+// @COMPLEXITY: 3
 // @SEMANTICS: auth, permissions, rbac, roles
 // @PURPOSE: Shared frontend RBAC utilities for route guards and menu visibility.
 // @LAYER: Domain

frontend/src/lib/auth/store.ts

@@ -1,5 +1,5 @@
 // [DEF:authStore:Store]
-// @TIER: STANDARD
+// @COMPLEXITY: 3
 // @SEMANTICS: auth, store, svelte, jwt, session
 // @PURPOSE:   Manages the global authentication state on the frontend.
 // @LAYER:     Feature