PR Readiness Check

Scan the current branch diff for common issues that could be flagged during PR review. This is a non-blocking check — always report findings as warnings and let the user decide what to act on.

Steps

1. Collect the diff

   git diff main...HEAD --name-only
   git diff main...HEAD
   

2. Check for missing tests

   For each new or modified source file with non-trivial logic changes (not just config, docs, or styles), check whether a corresponding test file was added or updated.