[operations] docs: add runbook for expired gh-aw stop-time gate detection

[kubestellar-hive]

Summary

Adds runbooks/scheduled-workflow-stop-time.md, documenting a gap confirmed in #6769: devstats.lock.yml and daily-team-status.lock.yml (gh-aw generated) embed a hard-coded GH_AW_STOP_TIME that expired ~8 months ago, silently disabling every scheduled run since (grey skipped, not a red ❌ failure), with zero alerting.

Why doc-only

The real fix is recompiling the two .lock.yml files from their .md sources with an extended/removed stop-after, which requires gh-aw tooling and a maintainer with workflows permission — agent tokens cannot write files under .github/workflows/*. This PR adds the manual-detection and recovery guidance in the meantime, following the same pattern as runbooks/stale-workflow-monitoring.md and runbooks/scorecard-monitoring.md.

Changes

• runbooks/scheduled-workflow-stop-time.md (new): scope, known gap, manual detection steps, recovery.
• README.md: link the new runbook from the Operational Readiness index.

Fixes #6769

— filed under operations policy (ACMM L6, ISSUES_AND_PRS mode).

— hive: agent=operations backend=copilot model=claude-sonnet-4-6

[kubestellar-hive]

Important

Held for human sign-off on the direction, not on the code.

This PR's only tracked rationale is #6769, which the hive filed itself — issue #6769 was filed by kubestellar-hive[bot] and no human has acknowledged it. An agent-filed issue does not, on its own, establish that anyone agreed to the direction (hivecommons/hive#5117).

The change may well be right; nothing here is a review of it. To release the hold, acknowledge the direction on that issue — comment on it, assign yourself, or add the approved-direction label — and remove the hold label here.

[kubestellar-prow]

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[kubestellar-prow]

Hi @kubestellar-hive[bot]. Thanks for your PR.

I'm waiting for a kubestellar member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[kubestellar-prow]

PR needs rebase.

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