Bind runtime and descriptor cleanup to exact retry leases and retain command supervisors until stop is confirmed. Preserve primary errors, partial Evidence and finalization cancellation reasons.
Validate with 88 focused tests, official WABT 1.0.42 CLI/MCP verifier (51 cases), build, static and documentation checks. Command stop failures use controlled source seams; real permission failures and target execution are unverified.
Fixes#4787Fixes#4798