ci: avoid rerunning guards after settled fast-guard failure

[teamleaderleo]

When the independent CI fast guards workflow settles as a failure, ci-guards.yml currently treats that result as unavailable and reruns the full 81-step ci guard group. That duplicates work on another runner while preserving no additional signal.

This change propagates a settled fast-guard failure as a single failure result and reserves the full fallback group for a missing or still-unavailable fast-guard check. The local planner and tests cover the three states (success, failure, unavailable).

Validation:

• Focused structural/unit tests pass.
• Full local CI guard group: 78 passed, 2 Linux-only skipped, 1 unrelated existing notification-semantics failure (expected 1 notification error, got 2).

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Summary by cubic

Stops rerunning the full ci guard group after the independent CI fast guards workflow settles as a failure.

Previously the status poller reduced both "unavailable" and "failed" to the same fallback, duplicating the 81-step suite on another runner without added signal. Now a settled failure propagates as a single failed result, and the fallback group runs only while the check is missing or still pending. The poller exposes a state output (success, failure, unavailable), and the ci matrix leg exits 1 when that state is failure. Local planner runs are unaffected because propagation relies on an Actions-only step.

^{Written for commit 0fef449. Summary will update on new commits.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 3121d49 and 0fef449.

📒 Files selected for processing (5)

• .github/workflows/ci-guards.yml
• scripts/ci/fast_guard_status.py
• scripts/ci/run_ci_guards.py
• tests/test_ci_fast_guard_status.py
• tests/test_ci_guard_workflow_structure.py

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[github-actions]

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[github-actions]

Merge receipt for 0fef449bfb: every check was green at merge (12 verified; 20 skipped by policy). Full suite runs on main after merge.