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verify: Quint model of pail Actions (designed, not yet built) - #47
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…leases, fencing verify/actions.qnt: replicas that read, decide and write one guarded Tier 1 commit from a stale read; runners that claim, refresh, report and crash; results, sweep, cancel, rerun, environment gate, checks. actions_sim.qnt: random interleavings with a ghost for the history properties; mutate_actions.sh flips each of 13 design switches. actions_scenarios.qnt: 16 runs for UC1-4, 6-8. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…jobs); two race scenarios Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Oct 31, 2026
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Replaces #45 (replayed onto main after #46; actions witness/mutate steps moved to the manual
model.yml).Adds a Quint model of pail Actions before any implementation: orchestrator replicas on Tier 1 (`_actions`/`_checks` branches, CAS/if-absent), runners on Tier 2 (`.actions/`: leases, results, cancel markers).
Design corrections found: result path per lease seq; intake fences on job file holder+seq (not live lease); lease seq counts claims, takeover by generation match; commits guard every record read; sweep of cancelled run cancels; rerun re-enters the concurrency group; `_checks` projected from accepted jobs only.
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