Record Case model admission gate

tools/validate_cto_child.py

@@ -334,12 +334,21 @@ REQUIRED_PROVIDER_BUILD_PRD_PHRASES = [
     "backend/provider-timeout.txt",
     "provider_timeout_fail_closed",
     "d23c492 Fail closed on Case provider timeout",
+    "anthropic",
+    "claude-sonnet-4-6",
+    "20260531T234205Z-r1-string-slugify-1834617/report.json",
+    "CTO_HARNESS_CASE_MODEL_PROVIDER",
+    "CTO_HARNESS_CASE_MODEL",
+    "backend/provider-model-not-admitted.txt",
+    "model_provider_gate_blocks",
+    "4500082 Gate Case execution on admitted model",
 ]
 
 REQUIRED_PROVIDER_BUILD_ISSUE_IDS = [
     "CTO-WORK-015",
     "CTO-WORK-016",
     "CTO-WORK-017",
+    "CTO-WORK-018",
 ]
 
 
@@ -573,6 +582,7 @@ def main() -> int:
             "CTO-WORK-015": "validated",
             "CTO-WORK-016": "blocked",
             "CTO-WORK-017": "validated",
+            "CTO-WORK-018": "validated",
         }
         for issue_id, expected in expected_statuses.items():
             checked.append(f"workboard_status:{issue_id}:{expected}")