Improve coding agent reliability

src/lai_automation/prompt.py

@@ -36,6 +36,7 @@ def build_task(report: FailureReport) -> str:
 
 Rules:
 - First add a regression test that reproduces the reported behavior.
+- The regression test must execute the relevant production behavior; never mock or stub the behavior being tested.
 - Make the smallest production change that fixes the root cause.
 - Preserve read-only SQL validation and tenant isolation.
 - Never read or modify .env files, credentials, deployment secrets, or production data.