feat: add TypeScript types for base58check.js

[Copilot]

Plan: Add TypeScript types for base58check.js

• Explore the repository structure and understand the codebase
• Review existing type definition patterns (base32.d.ts, base64.d.ts)
• Review base58check.js implementation and exported functions
• Create base58check.d.ts with type definitions for:
  • toBase58check (async)
  • fromBase58check (async)
  • toBase58checkSync (sync)
  • fromBase58checkSync (sync)
  • makeBase58check factory function
• Update package.json exports to include types field
• Update package.json files array to include base58check.d.ts
• Validate TypeScript types compile correctly
• Run tests to validate changes (all 104 tests pass)
• Run code review (no issues found)
• Run security scan (no vulnerabilities found)
• Remove unrelated change to .gitignore per review feedback

Summary

Successfully added comprehensive TypeScript type definitions for base58check.js following the existing patterns in the codebase. All tests pass, code review complete, and no security issues detected. Removed unrelated .gitignore change as requested.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Types: base58check.js</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Types: base58check.js #27

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[Copilot]

Pull request overview

This PR adds comprehensive TypeScript type definitions for the base58check.js module, which implements base58check encoding (commonly used in Bitcoin addresses). The types follow the established patterns in the codebase and include proper JSDoc documentation.

Changes:

• Added base58check.d.ts with complete type definitions for all exported functions and interfaces
• Updated package.json to include the new type definition file in exports and files array
• Enhanced README documentation with detailed descriptions for each base58check function

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
base58check.d.ts	Comprehensive TypeScript type definitions for base58check module including async/sync variants and factory function
package.json	Added base58check.d.ts to files array and types field to base58check.js export configuration
README.md	Added descriptive documentation for all base58check functions explaining their behavior

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