New sourced library implementing the factory side of the Phase-2 `fleet`
coordinator contract — curl-only + POSIX awk, reusing the Slice-4 HTTP/JSON
helper patterns, no new deps. Every function is a no-op unless AQ_FLEET=1.
- fleet_enabled / fleet_api (AQ_FLEET_API_CMD test seam) / _fleet_call
- fleet_detect_caps (reuses detect_capabilities) -> JSON caps array
- fleet_heartbeat (+ _maybe cadence): registration == first heartbeat
- fleet_claim: POST /fleet/claim, parse job id/bodyMd/leaseEpoch, materialize a
transient local .md (fleet-job-id + fleet-lease-epoch in frontmatter)
- fleet_report: PATCH fenced stage transition {stage, leaseEpoch, checkpoint?};
returns ok / FENCED(2, stale epoch -> self-abort) / degraded(1, unreachable)
- fleet_lease_renew / fleet_lease_release / fleet_renew_active (fenced)
- fleet_quarantine: park a reclaimed (fenced) job in failed/ for human triage
- cmd_fleet_status: register + print factory identity/caps
Report payloads carry only stage/epoch/checkpoint — never prompt/bodyMd/token.
