Make agent validation self-correcting

tests/test_prompt.py

@@ -1,5 +1,5 @@
 from lai_automation.models import FailureReport
-from lai_automation.prompt import build_task, redact
+from lai_automation.prompt import build_retry_task, build_task, redact
 
 
 def test_redact_removes_common_secrets_and_personal_markers() -> None:
@@ -51,3 +51,11 @@ def test_redact_removes_extended_credentials() -> None:
     assert "eyJhbGci" not in result
     assert "database-password" not in result
     assert "private-material" not in result
+
+
+def test_retry_task_contains_failure_without_secrets() -> None:
+    task = build_retry_task(RuntimeError("Missing import; token=secret-value"))
+
+    assert "Missing import" in task
+    assert "secret-value" not in task
+    assert "Do not remove or weaken tests" in task