Reproduce one CLI/API bug and return a tested fix

Delivery is one Markdown report plus a patch or diff when a code change is needed. It must include reproduction steps; observed versus expected behavior; the root cause tied to a file, line, or request; the smallest safe fix; and at least one focused regression test or reproducible validation command with its result. All stated commands must be runnable against the supplied public or attached material. Do not fabricate execution. If the issue cannot be reproduced from the provided inputs, return a blocker report with the exact missing requirement and do not invent a fix.