fix(deploy): ensure standards-sync label exists + document the deploy standard

[don-petry]

Summary

Two follow-ups to #480 (PR-based stub deploy):

1. Bugfix — sd_deploy_via_pr passed gh pr create --label standards-sync, which fails outright on any target repo lacking that label. None of the 7 consumer repos carry it (only .github-private does), so feat: implement issue #478 — deploy standard workflows via PRs, not direct pushes #480 as merged would fail PR creation on every real target. The lib now creates the label if missing (create-if-missing, no --force so an existing curated label is never clobbered) before opening the PR. Regression test added.
2. Docs — adds a "Deploying & syncing stubs" standard to standards/ci-standards.md: stubs are deployed via PRs (deploy-standard-workflows.sh, standards-sync label, never direct-push / never --admin), with the ruleset-protected-repo rationale.

How it was found

Caught by the controlled live verification requested for #480: running the real script on a ruleset-protected repo (ContentTwin) showed branch + Contents-API PUT + PR all work (no 409 — the original bug is fixed), but gh pr create failed on the missing label. After this fix, a live re-run opened a correctly-labeled PR (label auto-created) on ContentTwin with no 409; the throwaway PR was closed.

Validation

• bats — 14/14 pass (added: "ensures the label exists before opening the PR", asserting gh label create precedes gh pr create).
• shellcheck --severity=warning -x — clean.
• Live: fixed script opened a labeled standards-sync PR on the protected repo ContentTwin end-to-end (closed afterward).

Related (separate, not in this PR)

The verification also surfaced a three-way pin inconsistency between the deploy templates, the compliance audit's expected pins (check_centralized_workflow_stubs), and the fleet (e.g. dependency-audit/dependabot-automerge: template+audit @v1 but repos run @v2; agent-shield/dependabot-rebase templates SHA-pinned vs audit @v1). Filed separately — a blind re-sync would push downgrades/pin-flips, so it needs its own remediation.

Refs #478, #480.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 13be82d1-3405-415d-a926-f529c19a4f78

📥 Commits

Reviewing files that changed from the base of the PR and between 101ddfc and 91d842e.

📒 Files selected for processing (3)

• scripts/lib/standards-deploy.sh
• standards/ci-standards.md
• test/scripts/lib/standards-deploy.bats

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/standards-deploy-ensure-label

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[don-petry]

Dev-Lead — review-changes (no-changes)

No changes were needed for this PR.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[don-petry]

Dev-Lead — fix-bot-comment (no-changes)

Agent reasoning

**PR State:**
- All CI checks completed with `success` or `skipped` conclusions
- No reviews with `CHANGES_REQUESTED`
- One check (`Analyze (actions)`) still `in_progress` but no blocking conclusion yet
- No Tier 1 blockers (failures, timeouts, changes requested, etc.)
---
## Summary
**No actionable issues found.**
The SonarCloud bot comment reports a **passing quality gate** with zero new issues, zero security hotspots, and no code quality concerns. This is an informational status report, not an issue requiring fixes.
All CI checks pass. The PR is ready to merge.

[gemini-code-assist]

Code Review

This pull request updates the standard deployment script to ensure that the PR label exists on the target repository before creating a pull request, preventing failures when the label is absent. It also adds a regression test to verify this behavior and documents the stub deployment and syncing process in the CI standards documentation. There are no review comments, so I have no additional feedback to provide.

[don-petry]

Dev-Lead — fix-reviews (no-changes)

Agent reasoning

Addressed 0 threads:
  (no open review threads)
Test verification: PASS
  shellcheck: clean (no output)
  bats 14/14 tests passed:
    ok 1 opens a PR and reports OPENED with the url
    ok 2 happy path makes the full create call sequence
    ok 3 ensures the label exists before opening the PR
    ok 4 skips when an open PR already exists on the branch
    ok 5 idempotent skip makes no branch/PUT/PR-create calls
    ok 6 reuses an existing branch and still opens the PR
    ok 7 passes the existing blob sha when updating a drifted stub
    ok 8 fails cleanly when the base sha cannot be resolved
    ok 9 fails when the branch can neither be created nor found
    ok 10 fails when the PUT is rejected
    ok 11 fails when the PR cannot be created
    ok 12 fails when the local file is missing
    ok 13 dry-run plans a PR to create a missing stub
    ok 14 dry-run skips a stub that is already compliant
Files changed: none
```
The PR is clean: zero open review threads, all CI checks passing, and gemini-code-assist gave a positive review with no change requests. No changes were needed.