chore: update semantic contracts and git merge handling

backend/src/core/config_manager.py

@@ -1,6 +1,5 @@
 # [DEF:ConfigManager:Module]
 #
-# @TIER: CRITICAL
 # @COMPLEXITY: 5
 # @SEMANTICS: config, manager, persistence, migration, postgresql
 # @PURPOSE: Manages application configuration persistence in DB with one-time migration from legacy JSON.
@@ -9,13 +8,13 @@
 # @POST: Configuration is loaded into memory and logger is configured.
 # @SIDE_EFFECT: Performs DB I/O and may update global logging level.
 # @DATA_CONTRACT: Input[json, record] -> Model[AppConfig]
+# @INVARIANT: Configuration must always be representable by AppConfig and persisted under global record id.
 # @RELATION: [DEPENDS_ON] ->[AppConfig]
 # @RELATION: [DEPENDS_ON] ->[SessionLocal]
 # @RELATION: [DEPENDS_ON] ->[AppConfigRecord]
 # @RELATION: [DEPENDS_ON] ->[FileIO]
 # @RELATION: [CALLS] ->[logger]
 # @RELATION: [CALLS] ->[configure_logger]
-# @INVARIANT: Configuration must always be representable by AppConfig and persisted under global record id.
 #
 import json
 import os
@@ -31,7 +30,6 @@ from .logger import logger, configure_logger, belief_scope
 
 
 # [DEF:ConfigManager:Class]
-# @TIER: CRITICAL
 # @COMPLEXITY: 5
 # @PURPOSE: Handles application configuration load, validation, mutation, and persistence lifecycle.
 # @PRE: Database is accessible and AppConfigRecord schema is loaded.