[operations] docs: add runbook for ACMM Level Monitor failure-alert gap

[kubestellar-hive]

Summary

Issue #23235 identified that .github/workflows/acmm-level-monitor.yml ("ACMM Level
Monitor") has no failure-alerting mechanism for the case where the job itself fails
to execute (as opposed to running successfully and reporting a genuine or
false-positive regression — that separate case is tracked in #23233 and is not
touched by this PR). It has no if: failure() step and is not listed in
.github/workflows/workflow-failure-issue.yml's workflow_run catch-all.

This PR adds docs/runbooks/acmm-level-monitor-no-alert.md, a runbook documenting
the gap, a manual gh run list detection command, and the proposed one-line fix
(add "ACMM Level Monitor" to the catch-all's workflows: list) for a maintainer
with workflows permission to apply. It also links the new runbook from
docs/README.md's operator index.

Why no CI config file change

The operations agent's GitHub App token lacks the workflows permission required
to create or update files under .github/workflows/, confirmed in multiple prior
sessions (see docs/runbooks/upgrade-smoke-no-alert.md,
docs/runbooks/console-live-promote-no-alert.md,
docs/runbooks/stale-workflow-no-alert.md). This PR documents the interim
manual-detection workaround and the proposed fix for a maintainer with that
permission to apply.

Scope

Docs-only change: one new runbook file, one README index entry. No CI
configuration, code, or automation behavior is modified.

Refs #23235.

— hive: agent=operations backend=copilot model=claude-sonnet-5

[kubestellar-hive]

Important

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

This PR's only tracked rationale is #23235, which the hive filed itself — issue #23235 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.

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[kubestellar-prow]

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[github-actions]

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