chore: migrate buf-setup-action to buf-action for Node.js 24

[bjcoombs]

Summary

• Replaces bufbuild/buf-setup-action@v1 with bufbuild/buf-action@v1 (with setup_only: true) across all 14 workflow files (27 occurrences)
• buf-setup-action is pinned to Node.js 20, which GitHub Actions will deprecate on June 2, 2026
• buf-action runs on Node.js 24 and supports setup_only mode as a drop-in replacement

Test plan

• CI passes on this PR (the workflows themselves exercise the new action)
• Proto generation still works (buf generate step succeeds)
• No Node.js 20 deprecation warnings in CI annotations

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📥 Commits

Reviewing files that changed from the base of the PR and between 7dff219 and 62b3445.

📒 Files selected for processing (14)

• .github/workflows/benchmarks.yml
• .github/workflows/build.yml
• .github/workflows/codeql.yml
• .github/workflows/control-plane-ci.yml
• .github/workflows/conventions.yml
• .github/workflows/deploy-demo.yml
• .github/workflows/deploy-develop.yml
• .github/workflows/e2e.yml
• .github/workflows/nightly.yml
• .github/workflows/proto.yml
• .github/workflows/quality.yml
• .github/workflows/saga-validation.yml
• .github/workflows/security.yml
• .github/workflows/test.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-buf-action-node24

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[claude]

Clean mechanical replacement of bufbuild/buf-setup-action with bufbuild/buf-action (setup_only: true) across all 14 workflow files. Correct and consistent. No domain risks. See summary comment for details.

[claude]

Claude Code Review

Commit: 62b3445 | CI: running (Proto Validation + Proto Compilation passing)

Summary

Clean mechanical migration of bufbuild/buf-setup-action to bufbuild/buf-action with setup_only: true across all 14 workflow files. The replacement is consistent and correct. This addresses the upcoming Node.js 20 deprecation (June 2, 2026) by moving to Node.js 24.

Risk Assessment

Area	Level	Detail
Blast radius	Low	CI workflows only, no application code
Rollback	Safe	Single revert restores all workflows
Scale	N/A	No runtime impact
Cross-system	Low	Only affects buf CLI setup in CI
Migration	N/A	No database migrations

Findings

No issues found. The change is uniform across all files with the same pattern applied consistently.

Notes

• codeql.yml previously pinned buf-setup-action@v1.50.0 and now uses buf-action@v1. Since this is a different action, the old version pin does not carry over. This is expected.
• Proto Validation and Proto Compilation checks are already passing, confirming buf-action with setup_only: true correctly installs the buf CLI.
• Remaining CI checks are still running and will validate the new action end-to-end.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[claude]

Clean, consistent migration across all 14 workflow files. No issues found. See summary comment for details.