[bompus]

A new push to a pull request now cancels that pull request's older run of the same workflow, for the four workflows that run on pull requests: contained-source, daemon-lifecycle, highlight-lifecycle and kernel-stamp. All four trigger only on pull requests, so no run on fork/consolidated is affected.

The group key is the workflow name plus the pull request number. Each workflow has its own name, so they do not cancel each other.

In the last 30 days these workflows ran 141 times on pull requests. 24 of those were still running when a newer run started on the same branch, about 145 minutes of runner time, all of it from daemon-lifecycle. That figure is estimated from run timestamps. The workflows use path filters, so a push that matches no path starts no replacement run and the older run finishes as before.

README rows checked: none are affected, since no user-visible feature, number or config key changes. This pull request touches the workflow files, which are in their own path lists, so all four run on it.

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Summary by cubic

Adds concurrency cancellation to the four PR-only workflows (contained-source, daemon-lifecycle, highlight-lifecycle, kernel-stamp) so a new push to a PR cancels the older run of the same workflow. In the last 30 days, 24 of 141 PR runs were superseded, wasting roughly 145 minutes of runner time.

• The group key is the workflow name plus the PR number, so the four workflows don't cancel each other.
• Runs on fork/consolidated are unaffected since these workflows only trigger on pull requests.
• Path filters still apply: a push that matches no path won't start a replacement run, so the older run finishes as before.

^{Written for commit 597fe6f. Summary will update on new commits.}

Summary by CodeRabbit

• Chores
  • Updated pull request checks to cancel an earlier in-progress run when a newer run starts for the same workflow and pull request.
  • This prevents overlapping runs and ensures the latest changes are checked.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository YAML (base), Organization UI (inherited)
• Review profile: CHILL
• Plan: Advanced
• Run ID: 901e5ba5-a093-4b3b-9b3b-44aa93f3ab0c

📥 Commits

Reviewing files that changed from the base of the PR and between 4921cb2 and 597fe6f.

📒 Files selected for processing: 4

• .github/workflows/contained-source.yml
• .github/workflows/daemon-lifecycle.yml
• .github/workflows/highlight-lifecycle.yml
• .github/workflows/kernel-stamp.yml

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review.

📝 Walkthrough

Four GitHub Actions workflows now group runs by workflow and pull-request number. A new run cancels an in-progress run in the same group.

Changes: Workflow Run Concurrency

Layer / File(s)	Summary
Pull-request run grouping .github/workflows/contained-source.yml, .github/workflows/daemon-lifecycle.yml, .github/workflows/highlight-lifecycle.yml, .github/workflows/kernel-stamp.yml	Each workflow groups runs by workflow and pull-request number and cancels an in-progress run in the same group.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 597fe

The cancellation change is ready to merge after normal checks.

### Architecture Summary

Architecture risk: 🔵 Low · up to 597fe

The changed surface does not map to a changed system, dependency edge, entrypoint, or external dependency.

Changed systems: None identified.

Architecture concerns
No architecture-level concerns identified.

Review details

Before / after behavior

• observed — Modified behavior in .github/workflows/contained-source.yml: Adds a concurrency group keyed by workflow and pull-request number; a new run cancels any in-progress run in that group.
• observed — Modified behavior in .github/workflows/daemon-lifecycle.yml: Adds workflow concurrency keyed by workflow name and pull-request number; a new run cancels an in-progress run in that group.
• observed — Modified behavior in .github/workflows/highlight-lifecycle.yml: Adds workflow concurrency keyed by workflow name and pull request number; a new run in the same group cancels the in-progress run.
• observed — Modified behavior in .github/workflows/kernel-stamp.yml: Added concurrency control that groups runs by workflow and pull-request number and enables cancellation of an in-progress run in the same group.

Pre-merge checks: 6

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: canceling superseded pull request runs in the four affected workflows.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Suppressions Explained		The pull request adds only GitHub Actions concurrency settings with group and cancel-in-progress. These settings do not silence lint, type-check, or compiler diagnostics. No suppression directiv…
User-Visible Changes Documented		PASS: The pull request only adds GitHub Actions concurrency settings (concurrency, group, and cancel-in-progress) to four workflow files. It does not add, remove, or rename a CLI command or flag…

Full details: Suppressions Explained

Explanation

The pull request adds only GitHub Actions concurrency settings with group and cancel-in-progress. These settings do not silence lint, type-check, or compiler diagnostics. No suppression directive or ignore entry is added.

Full details: User-Visible Changes Documented

Explanation

PASS: The pull request only adds GitHub Actions concurrency settings (concurrency, group, and cancel-in-progress) to four workflow files. It does not add, remove, or rename a CLI command or flag, MCP tool or argument, supported language or framework, agent target, or product configuration key. README.md and site documentation therefore do not require updates.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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