Fleet dispatch hardening: retire raw-nohup hunts (timeout, heartbeat, durable logs, sweep-adoptable records)

[aarontrowbridge]

Important

Problem — Fleet research dispatch is fire-and-forget: QEC hunts launch as raw ssh <host> 'cd … && nohup … > /tmp/<hunt>.log 2>&1 &' — no timeout, no heartbeat, logs in /tmp (lost on reboot), status discovered by ps grep. A wedged hunt hangs invisibly forever; a reboot orphans it with no trace. The fleet registry's transition table already models crashed/orphaned records — nothing creates records for hunts.

Acceptance Criteria

• A hunt wrapper: timeout -k bounded, heartbeat file (mtime liveness), logs under ~/.amico/ops/hunts/<id>/ (durable, synced-adjacent)
• Hunts create fleet records at launch so fleet sweep adopts orphans (pid-liveness guarded — the registry's designed path)
• Status table reads records, not ps-grep
• The qec-autoresearch skill's dispatch section rewritten to the wrapper

Design-of-record: vault spec spec-20260818-gpu-plane (ladder item 3). erlich = the-feynmachine (24c + GT 1030 display card — CPU decoder replica; not compute-GPU class).