docs: correct CLAUDE.md Node version to match package.json (#1976)

[carlos-alm]

Summary

• CLAUDE.md's Node Version section said `>=22.6`, but `engines.node` in `package.json` was bumped to `>=22.12.0` in a later commit without updating CLAUDE.md to match.
• Also found the identical staleness in README.md's Node badge — filed separately as README.md Node version badge says >=22.6 but package.json requires >=22.12.0 #2190 since CLAUDE.md Node Version section says >=22.6 but package.json requires >=22.12.0 #1976 only named CLAUDE.md.

Verification

• Docs-only, single-line change. No code surface touched.

Closes #1976

[greptile-apps]

Greptile Summary

Updates CLAUDE.md to document the same minimum Node.js version required by package.json.

• Changes the documented minimum from Node.js 22.6 to 22.12.0.

Confidence Score: 5/5

The PR appears safe to merge because the documentation now matches the repository's declared Node.js requirement.

The only changed line updates CLAUDE.md from Node.js 22.6 to 22.12.0, exactly matching package.json and CONTRIBUTING.md without affecting runtime behavior.

Important Files Changed

Filename	Overview
CLAUDE.md	Correctly aligns the contributor-facing Node.js requirement with the package engine constraint.

_{Reviews (1): Last reviewed commit: "docs: correct CLAUDE.md Node version to ..." | Re-trigger Greptile}