feat: add @tsky/lex-cli for generating typescript definitions

[skiniks]

This PR introduces @tsky/lex-cli, a TypeScript definition generator forked from @atcute/lex-cli.

Key changes:

• Created @tsky/lex-cli package based on @atcute/lex-cli v1.0.3
• Updated imports and package names to use @tsky namespace
• Switched from @externdefs/collider to clipanion
• Switched from @badrap/valita to typanion for schema validation
• Simplified file structure by consolidating utility functions
• Added support for subscriptions in type generation
• Expanded JSDoc documentation handling

The PR includes generated type definitions for review in packages/lexicons/src/lib/lexicons.ts. Please review both the generator code and the resulting type definitions and let me know what you think!

Edit: Following suggestion from mary, replaced symbolic type branding with a more pragmatic approach using concrete $type fields. This change:

• Removes Brand namespace and symbolic type system
• Introduces TypedBase (optional $type) and RecordBase (required $type)
• Uses real runtime properties instead of nonexistent unique symbols
• Simplifies type unions with explicit type discrimination
• Improves TypeScript type inference and debugging

related to #30

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[skiniks]

@anbraten all set!

[anbraten]

In general thanks again for the amazing work 👍🏾 . This will be a good starting point to continue building the client functions now. Would suggest to merge this as is and adjust further when necessary while using the types.