What problems was I solving

The codecs library exported a Base64Bytes Zod codec that was never imported or used anywhere in the codebase, leaving dead code on the package's public surface.

What user-facing changes did I ship

No user-facing changes.

How I implemented it

Deleted architect/codecs/main/base64-bytes.ts and removed its export * from architect/codecs/main/index.ts. A full repository grep confirmed zero references to Base64Bytes or the base64-bytes module after the deletion.

Description for the changelog

Removed the unused Base64Bytes codec export from the codecs library and its re-export from the library index. This is a non-functional cleanup with no consumers, so it does not affect any runtime behavior.