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.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 0fa52101-7ebf-4a6a-80a7-30650271c96c

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📥 Commits

Reviewing files that changed from the base of the PR and between b6c5905 and ec7c478.

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📒 Files selected for processing (1)

• .github/workflows/pr-size.yml

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📝 Summary

Summary by CodeRabbit

• New Features
  • Pull requests are now automatically assessed for size during key review and update events, making their scope easier to gauge.
  • The workflow manages overlapping checks for the same pull request and completes within a set time limit.

Walkthrough

Adds a GitHub Actions workflow that runs a pinned PR-size action for pull request lifecycle events and submitted or dismissed reviews.

Changes

Pull request size workflow

Layer / File(s)	Summary
Workflow triggers and execution .github/workflows/pr-size.yml	The workflow defines pull request and review event triggers, permissions, and per-pull-request concurrency cancellation. Its job checks out full history without persisted credentials, then runs the pinned PR-size action on Ubuntu 24.04 with a five-minute timeout.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant PullRequestEvent as GitHub pull request or review event
  participant Workflow as GitHub Actions workflow
  participant Checkout as actions/checkout
  participant PRSize as Pinned PR-size action
  PullRequestEvent->>Workflow: Trigger workflow
  Workflow->>Checkout: Check out full history without persisted credentials
  Workflow->>PRSize: Run PR-size action

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Merge Risk: ⚪ Minimal · up to ec7c4

The PR size check appears ready to merge after normal workflow checks.

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

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