fix(ci): use whitespace-insensitive PR size diff

[maria-rcks]

What Changed

Use a whitespace-insensitive diff for PR size labels.

Why

GitHub's raw diff counts can overcount whitespace-only changes.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Warning

this might be a hallucination from codex

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Note

Medium Risk
Changes PR size labeling logic in CI to compute diff stats locally with git diff, which could shift size labels and depends on correct ref fetching in pull_request_target runs.

Overview
Updates the PR Size GitHub Action to compute effective changed lines using a local git diff --numstat that ignores whitespace and blank-line-only changes, instead of relying on the GitHub pulls.listFiles API.

The workflow now checks out and fetches base/head refs for the PR (avoiding the 3,000-file API truncation risk), excludes test files via git pathspec excludes, and logs a warning if the fetched head SHA differs from the PR’s reported head SHA.

^{Written by Cursor Bugbot for commit 0dbdc0e. This will update automatically on new commits. Configure here.}

Note

Fix PR size labeling to use whitespace-insensitive git diff --numstat

• Replaces the GitHub Pulls REST API file listing with local git diff --numstat --ignore-all-space --ignore-blank-lines to compute line change counts in pr-size.yml.
• Adds a repo checkout step and fetches both the base SHA and PR head ref (refs/pull/<number>/head) so the diff runs locally.
• Switches test file exclusion from regex matching to git pathspec :(glob,exclude) patterns passed directly to the diff command.
• Removes the prior 3000-file truncation warning that came with the paginated API approach.
• Behavioral Change: whitespace-only and blank-line changes no longer contribute to PR size counts.

^{Macroscope summarized 0dbdc0e.}

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[nmggithub]

This will break any PR's that explicitly rename a file. We'll get an overcalculated number of additions/deletions (counting each and every line of the renamed file). However, I believe Codex added this to make parsing the numstat easier. If desired, we can remove this flag and add additional parsing for renames. Or just leave this as is and keep rename calculations being off as an acceptable risk.

[maria-rcks]

should be good now

[nmggithub]

Well, that certainly is one way to do it. Now we're not parsing the filename from numstat at all. I think that should be good, yeah.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[juliusmarminge]

yolo