refactor: switch admin ops from protobuf to binary encoding

[vieiralucas]

Summary

• Remove protobufjs runtime dependency and all proto files (proto/)
• Update test helpers to use binary wire format for createQueue and listQueues admin operations
• Remove protobuf loading/encoding/decoding from test infrastructure

Test plan

• npx tsc --noEmit passes (verified locally)
• Integration tests pass against a FIBP server with binary admin encoding (PR #153)
• No protobuf imports remain in the codebase

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Summary by cubic

Switched admin operations to a custom binary wire format and removed all protobuf usage. This simplifies tests and removes the protobufjs runtime.

• Refactors

  • Deleted proto/ and removed protobuf encode/decode paths from tests.
  • Encoded CREATE_QUEUE and LIST_QUEUES admin requests as binary in test/helpers.ts.
  • Marked admin op bodies as binary in src/transport.ts.
  • Removed proto/ from package.json files so it’s no longer published.

• Dependencies

  • Removed protobufjs from runtime dependencies.

^{Written for commit ca8f27f. Summary will update on new commits.}

[cubic-dev-ai]

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