Add code comment to encode.ts explaining the strict bigint-only policy for IDs

[codeZe-us]

JS developers default to number. Future contributors must understand that all ID variables must remain bigint to prevent precision loss.

Implementation Guidelines

Key Files: packages/core-ts/src/muxed/encode.ts.

• Insert a clear multi-line comment stating that variables matching to ID must remain bigint.

Expectations

What done looks like: The comment clearly explains the bigint-only policy to any future contributor.

Discord for any question: codeze_us

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