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Neil
f8f656ca19
A concurrency slot is charged per job, not per core, and the account's cap is the scarce resource: standard runner minutes are free and unlimited on a public repository. Two paths spent slots that bought nothing. The unit matrix ran eight fixed shards averaging 6.5 minutes each, 3384 job-slots a day and 68% of all slot demand, while the arm pool queued 10.5 minutes at p95 — the queue was the oversharding. Five shards run the same work in ~10.5 minutes each for three fewer slots per run. Bun profile persistence escalated to all six platforms on `config/`, `resources/` and `.github/` wholesale, which took 36.5% of the last 1100 commits through the full matrix where a platform-flavoured predicate takes 19%. A pull request now qualifies one platform unless the change is platform- flavoured, and the push to main re-qualifies all six, so an unescalated miss surfaces minutes after merge rather than at the next cron. Missing changed-file evidence and an unavailable dependency graph still fail closed to all six.