Host closeout: personally reviewed PR diff and D601 read-only revalidation. This supersedes stale/conflicting #196 by adding a latest-main artifact/runtime readiness guard and unit coverage without wiring live HTTP checks into default validate/check. It prevents SOURCE/local/static/report-only evidence from being treated as deployed latest-main readiness and keeps M3/M4/M5 acceptance out of scope. No deploy, restart, Kubernetes mutation, DB mutation, Secret read, live smoke, or acceptance claim is included.
Merge PR #152 after Code Queue rebase and validation. This lands the DEV Cloud Web publish/apply contract, dist freshness checks, artifact identity evidence, and read-only rollout observation. No PROD changes and no live deploy claim.
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