refactor: remove legacy ktx compatibility shims (#211)

* refactor: remove legacy ktx compatibility shims

* fix: restore overlay collision guidance

python/ktx-daemon/tests/test_database_introspection.py

@@ -138,6 +138,18 @@ def test_introspect_database_response_rejects_non_postgres_driver() -> None:
         )
 
 
+def test_introspect_database_response_rejects_legacy_postgresql_driver() -> None:
+    with pytest.raises(ValueError, match='supports only driver "postgres"'):
+        introspect_database_response(
+            DatabaseIntrospectionRequest(
+                connection_id="warehouse",
+                driver="postgresql",
+                url="postgresql://readonly@example.test/warehouse",
+            ),
+            load_rows=lambda request: DatabaseIntrospectionRows([], [], []),
+        )
+
+
 def test_database_introspection_request_rejects_empty_schema_list() -> None:
     with pytest.raises(ValueError, match="at least one schema"):
         DatabaseIntrospectionRequest(

python/ktx-daemon/tests/test_semantic_layer.py

@@ -3,6 +3,8 @@ from __future__ import annotations
 import json
 from pathlib import Path
 
+import pytest
+
 from ktx_daemon.semantic_layer import (
     SemanticLayerQueryRequest,
     ValidateSourcesRequest,
@@ -95,6 +97,16 @@ def test_query_semantic_layer_emits_plan_and_sql_debug_events(
     assert "public.orders" not in captured.err
 
 
+def test_semantic_layer_request_rejects_project_id_field_name() -> None:
+    with pytest.raises(ValueError):
+        SemanticLayerQueryRequest(
+            sources=[],
+            dialect="postgres",
+            project_id="a" * 64,
+            query={"measures": ["orders.order_count"]},
+        )
+
+
 def test_validate_semantic_layer_reports_duplicate_measure_names() -> None:
     invalid_source = {
         **ORDERS_SOURCE,