feat: completion-enforcement loop (fallback, proof, emit-model, auditor)
Close the loop so dispatched work actually completes on bl:
- on_no_result fallback in followup-sweeper (op + job forms via
exec-constrained registry / job-dispatch), seeded on the three
autonomy-pulse jobs; fallback_due() dedupes the gravity path
- gravity.py: add __main__ entry (loop-remediator.timer was a no-op),
300s re-arm budget, fallback firing + stamp/skip logic
- harvester: proof-of-result followups (result_has_evidence),
acted-variant NACK, emit-model tool-hint wording
- envelope: RESPONSE RULE states the emit model (agents EMIT
directives verbatim; runtime executes; works from bare containers)
- completion-audit.py + systemd 15-min timer: per-family funnel,
swarm drain, followup backlog; digest DM when degraded, 6h heartbeat
- tests/test_completion.py (29 tests), JOB-SPEC.md docs
Tests: 67/67 focused green (completion + tool_calls).
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