Add the PR size check

[ryanbarlow97]

Adds the shared PR size check from TF-Minecraft/TLibs#39. It labels pull requests size:XS to size:XXL and, from size:L, requires an approval from someone other than the author. See Pull request size.

After this merges, the ruleset requires the "PR size" check instead of one approval on every pull request.

🤖 Generated with Claude Code

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 8c7f87a9-0eb4-479a-8db4-f369462651c6

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📥 Commits

Reviewing files that changed from the base of the PR and between bf209f8 and 5b231b1.

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📒 Files selected for processing (1)

• .github/workflows/pr-size.yml

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📝 Summary

Summary by CodeRabbit

• Chores
  • Added automated pull request size checks for selected pull request and review events. Size information is now checked as the pull request progresses through these events.

Walkthrough

Adds a pull request workflow that checks out the repository and runs a pinned PR-size action for selected pull request lifecycle and review events.

Changes

PR size workflow

Layer / File(s)	Summary
Workflow execution .github/workflows/pr-size.yml	Defines event triggers, permissions, per-pull-request concurrency cancellation, a five-minute Ubuntu 24.04 job, full-history checkout without persisted credentials, and the pinned PR-size action.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Feature

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Merge Risk: ⚪ Minimal · up to 5b231

No actionable merge-blocking issue was established for the PR-size workflow. Merge after normal checks.

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

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