fix(ci): skip commit when API ref generation produces no changes

[jlimatampersand]

Problem

The gen-ref-pages workflow was failing on its Push changes step (e.g. run 29853466481).

The step ran git commit unconditionally after git add src/. When pnpm run generate produced no changes under src/ (the API reference was already up to date), nothing was staged, so git commit exited with code 1 — and because the step shell runs under set -e, the whole job failed.

git add src/
git commit -m "..."
→ no changes added to commit
##[error]Process completed with exit code 1.

Fix

Guard the commit so an empty staged diff is a clean no-op:

git add src/
git diff --cached --quiet || git commit -m "..."

When there are generated changes, it commits and pushes as before. When there aren't, the commit is skipped and the subsequent git push just reports "Everything up-to-date".

🤖 Generated with Claude Code