E1603. Args hash mismatch (deterministic check)
Severity: ERROR. Integrity signal.
What happened
The args hash recomputed by the engine on this audit row does not match the args hash the SDK shipped. Either the args were mutated in flight or the JCS canonicalizer drifted between SDK and engine.
How to fix
Upgrade the SDK to match the engine version (run controlzero version and compare against the backend health endpoint).