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

backend/src/models/profile.py

@@ -1,6 +1,6 @@
 # [DEF:backend.src.models.profile:Module]
 #
-# @TIER:      STANDARD
+# @COMPLEXITY: 3
 # @SEMANTICS: profile, preferences, persistence, user, dashboard-filter, git, ui-preferences, sqlalchemy
 # @PURPOSE:   Defines persistent per-user profile settings for dashboard filter, Git identity/token, and UX preferences.
 # @LAYER:     Domain
@@ -20,7 +20,7 @@ from .mapping import Base
 
 
 # [DEF:UserDashboardPreference:Class]
-# @TIER: STANDARD
+# @COMPLEXITY: 3
 # @PURPOSE: Stores Superset username binding and default "my dashboards" toggle for one authenticated user.
 class UserDashboardPreference(Base):
     __tablename__ = "user_dashboard_preferences"