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/core/__tests__/test_config_manager_compat.py

@@ -1,5 +1,5 @@
 # [DEF:backend.src.core.__tests__.test_config_manager_compat:Module]
-# @TIER: STANDARD
+# @COMPLEXITY: 3
 # @SEMANTICS: config-manager, compatibility, payload, tests
 # @PURPOSE: Verifies ConfigManager compatibility wrappers preserve legacy payload sections.
 # @LAYER: Domain

backend/src/core/__tests__/test_superset_profile_lookup.py

@@ -1,5 +1,5 @@
 # [DEF:backend.src.core.__tests__.test_superset_profile_lookup:Module]
-# @TIER: STANDARD
+# @COMPLEXITY: 3
 # @SEMANTICS: tests, superset, profile, lookup, fallback, sorting
 # @PURPOSE: Verifies Superset profile lookup adapter payload normalization and fallback error precedence.
 # @LAYER: Domain

backend/src/core/__tests__/test_throttled_scheduler.py

@@ -3,7 +3,7 @@ from datetime import time, date, datetime, timedelta
 from src.core.scheduler import ThrottledSchedulerConfigurator
 
 # [DEF:test_throttled_scheduler:Module]
-# @TIER: STANDARD
+# @COMPLEXITY: 3
 # @PURPOSE: Unit tests for ThrottledSchedulerConfigurator distribution logic.
 
 def test_calculate_schedule_even_distribution():