Add two Claude Code helper functions to streamline common dev workflows:
- `claude-docs`: triggers Claude to sync README.md with recent session changes
- `claude-pr`: triggers Claude to create a branch, commit, push, and open a PR
Also add `.claude` to .gitignore and document both functions in README.md.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
