Code modernization

Updated lint and fixed modernization errors

Initial Public Release

Initial release of tokenctl.

Features:

• W3C Design Tokens format
• Tailwind 4 and pure CSS output
• Theme inheritance with $extends
• Computed colors: contrast(), darken(), lighten(), shade()
• Component generation with variants/sizes
• Responsive tokens via $breakpoints/$responsive
• Layer validation with --strict-layers
• Category-scoped manifests for LLM integration