Add missing docstrings to JavaScript with types implementation #19

The JavaScript package with typed features is missing quite a bit of docstrings.

Issue Description

The JavaScript implementation of CodeUChain with opt-in generic typing features needs comprehensive docstring coverage to match the quality and completeness of other language implementations.

Areas Needing Documentation

• TypeScript definition files ( files) - currently have minimal JSDoc comments
• Generic type parameters in JSDoc annotations
• Type evolution methods and their usage patterns
• Mixed typed/untyped usage examples
• Error handling in typed contexts
• Performance characteristics of typed vs untyped operations

Current State

• Core JavaScript files have extensive JSDoc documentation ✅
• Example files are well-documented ✅
• Test files have comprehensive documentation ✅
• README.md covers typed features well ✅
• TypeScript definitions lack detailed docstrings ❌

Expected Outcome

• Complete JSDoc coverage for all public APIs
• TypeScript IntelliSense support with detailed descriptions
• Usage examples for all typed features
• Clear migration guide from untyped to typed code
• Performance comparison documentation

Files to Update

• (enhance existing docs)
• (if needed)
• (if needed)

Acceptance Criteria

• All public APIs have comprehensive JSDoc comments
• TypeScript definitions provide full IntelliSense support
• Type parameters are properly documented
• Usage examples for all major patterns
• Error handling documented for typed contexts
• Performance characteristics documented
• Mixed typed/untyped usage clearly explained

Priority

High - Documentation is crucial for developer adoption of typed features.