[DevVig]

What

Cost hygiene for GitHub Actions: cancel superseded PR/push CI, run the CodeRabbit fallback cron once daily on weekdays, and cap release artifact retention at 7 days.

Why

Avoid overlapping CI runs, hourly fallback sweeps, and the default 90-day artifact retention on Release uploads.

How was this tested?

PyYAML parse of the changed workflow files. No application code.

Applied

• Concurrency on PR/push CI workflows that lacked it (group: ${{ github.workflow }}-${{ github.ref }}, cancel-in-progress: true):
  • .github/workflows/ci.yml
  • .github/workflows/pr-title.yml
• CodeRabbit fallback cron: was hourly 59 * * * *; now once daily on weekdays 59 0 * * 1-5 (00:59 UTC) in .github/workflows/coderabbit-fallback-review.yml.
• Artifact retention: retention-days: 7 on all four actions/upload-artifact steps in .github/workflows/release.yml (binaries-*, ui-*, release-assets-*, formula-*). Same-run download/publish is unaffected; GitHub Release assets are separate.

Skipped (required status checks)

Did not add docs-only paths-ignore (**/*.md, docs/**) to .github/workflows/ci.yml. That workflow provides the required checks on main (ruleset Protect main, CONTRIBUTING.md, docs/governance.md):

• rust (ubuntu-latest)
• rust (macos-latest)
• ui

Skipping it on docs-only PRs would leave those required checks unreported.

Judgment calls (left unchanged)

• No paths-ignore on .github/workflows/pr-title.yml: it lints PR titles, not files. Docs-only PRs still need the conventional-title gate (advisory per governance, but documented as the title enforcer).
• No concurrency on .github/workflows/release.yml or .github/workflows/finalize-release.yml (deploy/release/publish).
• Left existing CodeRabbit concurrency (group: coderabbit-fallback-review, cancel-in-progress: false); that workflow is cron/review, not PR/push CI.
• No Swift/Xcode path filters: there are no Swift/Xcode jobs. macOS jobs here are Rust, Tauri, and Homebrew.
• Did not split the non-required adapters job out of ci.yml solely to attach paths-ignore.
• No docs paths-ignore on the CodeRabbit fallback workflow (not a test/lint workflow; also runs on schedule and issue comments).

Checklist

• No application code; workflow YAML only
• Protocol changes update both mb-protocol and docs/protocol.md
• Adapter PRs: the adapter checklist is satisfied
• Nothing added to the daemon's idle footprint (CPU, RSS, network)

  

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Commits

Reviewing files that changed from the base of the PR and between 2b1e295 and 6f98d53.

Files selected for processing: 4

• .github/workflows/ci.yml
• .github/workflows/coderabbit-fallback-review.yml
• .github/workflows/pr-title.yml
• .github/workflows/release.yml

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

_{Comment @coderabbitai help to get the list of available commands.}

[Copilot]

🟢 Approval recommended

The reviewer's examination surfaced no objective defects, with each workflow-YAML change checked and found sound.

No open issues 🎉

What changed in this PR

This PR applies GitHub Actions cost-hygiene changes to reduce wasted CI minutes and artifact storage. It cancels superseded PR/push runs via concurrency, reduces the CodeRabbit fallback review cron from hourly to once-daily on weekdays, and caps release artifact retention at 7 days. It is workflow-YAML only with no application/daemon code changes, consistent with the repo's tag-driven release pipeline.

Changes:

• Add concurrency (group per workflow+ref, cancel-in-progress: true) to ci.yml and pr-title.yml to cancel superseded runs.
• Change CodeRabbit fallback schedule from 59 * * * * (hourly) to 59 0 * * 1-5 (weekday daily at 00:59 UTC), with updated explanatory comments.
• Set retention-days: 7 on all four actions/upload-artifact steps in release.yml.

File	Description
.github/​workflows/​ci.yml	Adds concurrency block to cancel superseded CI runs on PR/push.
.github/​workflows/​pr-title.yml	Adds concurrency block to cancel superseded PR-title lint runs.
.github/​workflows/​coderabbit-fallback-review.yml	Reduces fallback review cron from hourly to weekday-daily; updates comments.
.github/​workflows/​release.yml	Caps artifact retention at 7 days on all four upload-artifact steps.

_{Review effort: Balanced}