feat(webapp,run-engine): mollifier drainer replay + stale sweep + cancelled-run engine API#3754

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d-cs wants to merge 13 commits into

mollifier-phase-3-triggerfrom

mollifier-phase-3-replay

Commits on May 28, 2026

feat(webapp,run-engine): mollifier drainer replay + stale sweep + cancelled-run engine API

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fix(webapp,run-engine): replay-layer code-review follow-ups

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test(webapp): isolate mollifierDrainerWorker test from runEngine singleton

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test(webapp): bump mollifierStaleSweep redisTest timeouts to 20s

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fix(webapp,run-engine): replay-layer Devin follow-ups

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docs(server-changes): scope mollifier drainer-replay note to this PR

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fix(webapp): honour cancel-wins conflict + requeue on transient PG outage in mollifier drainer

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docs(mollifier): strip internal planning labels from comments

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docs(mollifier): fix stale ZSET comments and strip residual plan-doc labels

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perf(webapp): shard the mollifier stale sweep to bound per-tick work

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test(webapp): fill mollifier stale-sweep coverage gaps

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fix(webapp): GC drained-env orphans in stale sweep + propagate batch on terminal failure

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fix(webapp): stale-sweep stop() awaits in-flight tick before closing Redis

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