What problems was I solving

The codecs package exported a Utf8Bytes codec that was never imported or used anywhere in the monorepo, leaving dead code and an unused public API surface.

What user-facing changes did I ship

None. This is an internal cleanup with no user-visible behavior or runtime changes.

How I implemented it

Deleted architect/codecs/main/utf8-bytes.ts and removed its barrel re-export from architect/codecs/main/index.ts.

Description for the changelog

Removed the unused Utf8Bytes codec and its re-export from the codecs package. The symbol had no internal callers, so there is no expected behavior change, but any external consumer importing it directly from @architect/codecs will need to replace it with a local TextEncoder/TextDecoder implementation.