- Updated description of server-client transport to use Protobuf-based, length-prefixed envelopes.
- Revised notes on handling large HTTP bodies and outlined plans for stream/frame-based tunneling.
- Updated `progress.md` with finalized implementation of MTU-safe chunk size constant.
- Designed a stream/frame-based protocol leveraging `StreamOpen`, `StreamData`, and `StreamClose` fields for chunked transmission.
- Addressed DTLS/UDP MTU limits by capping tunneled body sizes to 48 KiB and replacing oversized responses with `502 Bad Gateway`.
- Updated `internal/protocol` to enable safe handling of large HTTP bodies via streaming.
- Documented future work on replacing JSON with binary encoding for improved performance.