Add dev:symlink and dev:unlink scripts to enable seamless testing of
development changes using the global 'ccs' command without needing to
pack/install globally each time.
- scripts/dev-symlink.sh: New script that safely creates symlinks from
global ccs to dev dist/ccs.js with backup/restore functionality
- package.json: Added dev:symlink and dev:unlink npm scripts
- CONTRIBUTING.md: Updated development setup documentation with
symlink workflow option
This improves developer experience by allowing immediate testing of
changes with 'ccs <command>' instead of './dist/ccs.js <command>'.
