fix(reporter): add generation_mode to K008 schema and fix test

- Add generation_mode field to K008.schema.json (was missing after merge)
- Add K008 to expected_report_codes in test_generators_unit.py

Author: NikolayS

reporter/schemas/K008.schema.json

@@ -7,6 +7,7 @@
   "properties": {
     "version": { "type": ["string", "null"] },
     "build_ts": { "type": ["string", "null"] },
+    "generation_mode": { "type": "string", "enum": ["full", "express"] },
     "checkId": { "const": "K008" },
     "checkTitle": { "const": "Top queries by shared blocks hit+read" },
     "timestamptz": { "type": "string" },

tests/reporter/test_generators_unit.py

@@ -909,7 +909,7 @@ def _(*args, **kwargs):
         'A002', 'A003', 'A004', 'A007',
         'D004', 'F001', 'F004', 'F005', 'G001',
         'H001', 'H002', 'H004',
-        'K001', 'K003', 'K004', 'K005', 'K006', 'K007',
+        'K001', 'K003', 'K004', 'K005', 'K006', 'K007', 'K008',
         'M001', 'M002', 'M003',
         'N001',
     }