CI: diagnose failure of the contract-lint check itself (wayfinder #165, PR #157) #158

Summary

PR #157 introduces the contract-lint skill (skills/contract-lint — README.md, action.yml, lint.sh), and its own CI is failing: "CI: All jobs have failed," with the check dying in ~7 seconds with 3 annotations.

Because this PR introduces the lint, a fast failure like this points at the check/workflow setup (syntax error, missing input, script bug) rather than lint findings on existing code.

Evidence

• CI failure notification: 2026-10-07 ~18:05 PT (GitHub notification email)
• "CI: All jobs have failed" — check completed in ~7s, 3 annotations

Next steps

• Pull the failure annotations from the workflow run and identify the root cause in the new action/lint.sh
• Fix and re-run

Wayfinder #165 contract-lint rollout follow-up.