#skip-bb

## Summary
This PR adds a new GitHub Actions workflow that automatically cancels
in-progress and queued CI workflow runs when a pull request is merged.
This helps reduce unnecessary CI resource consumption and prevents stale
workflow runs from completing after their changes have already been
integrated.

## Changes
- Added `.github/workflows/cancel-ci-after-merge.yml` workflow that:
  - Triggers when a pull request is closed (merged)
  - Finds the CI workflow in the repository
- Queries for all in-progress and queued CI runs on the merged PR's
branch
  - Cancels each identified workflow run with error handling and logging
  - Includes comprehensive console logging for debugging and monitoring

## Implementation Details
- The workflow uses `actions/github-script@v7` to interact with the
GitHub Actions API
- It specifically targets the "CI" workflow by name
- Handles both "in_progress" and "queued" statuses to catch all active
runs
- Includes try-catch error handling to gracefully handle cancellation
failures
- Requires `actions: write` permission to cancel workflow runs
- Only executes when `github.event.pull_request.merged == true` to avoid
running on rejected PRs


<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Automatically cancel active CI runs for the merged PR’s head commit.
Frees up runners and prevents stale builds from finishing.

- **New Features**
- Adds .github/workflows/cancel-ci-after-merge.yml triggered on PR
closed, gated to merged PRs.
- Targets the CI workflow via file path ci.yml and lists runs for the PR
head SHA.
- Cancels active runs (in_progress, queued, pending, waiting) with
try/catch error handling and de-duplicates by run ID.
- Supports fork and non-fork PRs; uses actions/github-script@v7 with
actions: write permissions and clear console logs.

<sup>Written for commit 4d631b3ccb9d127c4781b185b9d6eac90d2fd710.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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Co-authored-by: Claude <noreply@anthropic.com>