Switch to noble-hashes

[daveroga]

Remove custom SHA-256 implementation and replace with noble-hashes

[Copilot]

Pull Request Overview

This PR replaces the custom SHA-256 implementation with the noble-hashes library, simplifying the codebase by removing ~250 lines of custom cryptographic code in favor of a well-established, audited library.

• Replaces custom SHA-256 implementation with @noble/hashes/sha2
• Removes the Hash class export since it's no longer available
• Maintains the same sha256 function interface for backward compatibility

Reviewed Changes

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

File	Description
src/sha256.ts	Removes entire custom SHA-256 implementation and replaces with noble-hashes import
src/index.ts	Removes Hash class from exports since it's no longer available

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