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/mapping_service.py

@@ -1,6 +1,6 @@
 # [DEF:backend.src.core.mapping_service:Module]
 #
-# @TIER:      CRITICAL
+# @COMPLEXITY: 5
 # @SEMANTICS: mapping, ids, synchronization, environments, cross-filters
 # @PURPOSE:   Service for tracking and synchronizing Superset Resource IDs (UUID <-> Integer ID)
 # @LAYER:     Core
@@ -21,7 +21,7 @@ from src.core.logger import logger, belief_scope
 # [/SECTION]
 
 # [DEF:IdMappingService:Class]
-# @TIER: CRITICAL
+# @COMPLEXITY: 5
 # @PURPOSE: Service handling the cataloging and retrieval of remote Superset Integer IDs.
 #
 # @TEST_CONTRACT: IdMappingServiceModel ->