feat(spec): sentry supervisor workflow spec, review-completeHEADmain

Spec for the overnight hygiene supervisor: ten serialized passes, mkdir-atomic locks with heartbeat under the runtime dir, a host-suffixed unpushed branch, interactive entry gates with no report-only mode, and roam-sync kept as the roam repo's only committer. All 10 decisions and 12 adversarial-review findings are resolved in the file; status stays DRAFT pending a deep read. The build task and three deferrals are filed.

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