Addresses PR #2884 feedback to move testing guidelines from AGENTS.md
into CONTRIBUTING.md where both humans and agents will see it.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Replace 'Ergonomic improvements' with 'Usability improvements' for better accessibility
- Add guidance encouraging enhancements that demonstrate underutilized MCP protocol features
Co-authored-by: adam jones <domdomegg@users.noreply.github.com>