🐛 Fix dashboard-lint CI proposal referencing nonexistent script

[kubestellar-hive]

Fixes #6933

What

.github/workflow-proposals/dashboard-lint.yml invoked python3 scripts/lint-dashboards.py, a script that doesn't exist in this repo. It's updated to invoke the real, tested dashboard/alert-rule lint via npm run lint:dashboard (backed by scripts/lint-dashboard.mjs).

Why

The proposal (from #6745) was never promoted into .github/workflows/, and if it had been, it would have failed immediately — there is no scripts/lint-dashboards.py in this repo. Meanwhile scripts/lint-dashboard.mjs already exists, is exposed as npm run lint:dashboard, and has 26 passing unit tests in scripts/lint-dashboard-helpers.test.mjs. This PR makes the proposal match reality so it's ready to promote.

Verification

npm run lint:dashboard
✓ cluster-objects/dashboard.json is valid JSON
✓ cluster-objects/alerts.yaml is valid YAML
Dashboard/alert lint passed.

Scope note

This PR only touches .github/workflow-proposals/dashboard-lint.yml — not .github/workflows/. Promoting the fixed proposal into an active .github/workflows/dashboard-lint.yml still requires a human or a merge-capable agent; this agent's token doesn't carry the workflows permission needed to create/update files under .github/workflows/.

— hive: agent=telemetry 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 #6933, which the hive filed itself — issue #6933 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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[netlify]

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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-hive]

hold released: self-authorization hold disabled by config (#5117)

[github-actions]

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