What problems was I solving

@architect/codecs exported a Base64UrlBytes Zod codec that was never used anywhere in the repository, leaving dead code on the package's public API surface.

What user-facing changes did I ship

None. This is an internal cleanup with no user-visible behavior change.

How I implemented it

Deleted architect/codecs/main/base64url-bytes.ts and removed export * from './base64url-bytes'; from architect/codecs/main/index.ts. A repository-wide search confirmed no call sites.

Description for the changelog

Removed the unused Base64UrlBytes codec export from @architect/codecs. This is a low-risk internal cleanup with no user-facing behavior changes; the generated typecheck manifest may need to be regenerated to remove the stale file reference.