fix: resolve mypy strict errors for AIConfig | None union types

Author: sunbos

plugins/mcp-server-sqlseed/src/mcp_server_sqlseed/server.py

@@ -238,6 +238,7 @@ def sqlseed_gemma4_analyze(
     ai_config, err = _build_ai_config(db_path, model, backend)
     if err is not None:
         return err
+    assert ai_config is not None  # guaranteed by err check above
 
     with DataOrchestrator(db_path) as orch:
         _validate_table_name(table_name, orch.get_table_names())
@@ -280,6 +281,7 @@ def sqlseed_gemma4_agent_fill(
     ai_config, err = _build_ai_config(db_path, model, backend)
     if err is not None:
         return err
+    assert ai_config is not None  # guaranteed by err check above
 
     # Step 1: AI analysis with self-correction
     analyzer = SchemaAnalyzer(config=ai_config)

plugins/sqlseed-ai/src/sqlseed_ai/analyzer.py

@@ -265,7 +265,9 @@ def _find_local_fallback_model(
         not just the first one. Returns the actual local model ID if found,
         or None if no suitable fallback exists.
         """
-        all_local = self._config._detect_all_local_models()
+        config = self._config
+        assert config is not None, "AIConfig must be initialized before checking local fallback"
+        all_local = config._detect_all_local_models()
         if not all_local:
             return None
 
@@ -287,7 +289,7 @@ def _find_local_fallback_model(
             return None
 
         # Walk the fallback chain and find the first available local model
-        candidate = next_model
+        candidate: str | None = next_model
         while candidate is not None:
             cand_norm = _normalize_model_id(candidate)
             if cand_norm in local_map: