fix(types): reject bigint typed arrays in encoders

[bytaesu]

Align encoder input types with Uint8Array runtime semantics while preserving BigInt typed arrays for Web Crypto APIs

[bytaesu]

I'll cut new minor version

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[greptile-apps]

Greptile Summary

This PR aligns encoder input types with their existing runtime behavior.

• Introduces NumberTypedArray, including Uint8ClampedArray while excluding BigInt typed arrays.
• Narrows Base32, Base64, hexadecimal, and toUint8Array encoder inputs to number-based typed arrays.
• Preserves BigInt typed-array support for Web Crypto buffer-source paths.
• Adds tests and documentation for the revised type contracts.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

The narrowed encoder types match the existing numeric conversion behavior, while decoding and Web Crypto paths continue to accept BigInt typed-array views where their runtime APIs support them.

_{Reviews (1): Last reviewed commit: "Merge branch 'main' into 2026-07-25/fix/..." | Re-trigger Greptile}