Module framing 

Length-prefixed framing: [u32 BE length][u8 kind][payload].

The FrameCodec is a Tokio Decoder + Encoder that converts raw byte streams into typed Frame values. Both MessagePack (default) and JSON (debug) encodings are supported; the choice is set once at construction and must match the Go supervisor’s transport.Conn encoding.

Frame kind constants align with go/transport:

• KIND_REQUEST = 1 — Go → Rust
• KIND_RESPONSE = 2 — Rust → Go
• KIND_EVENT = 3 — Rust → Go (async, unsolicited)

Structs

FrameCodec

Stateless codec; encoding is fixed at construction.

Enums

Encoding

Frame

A decoded wire frame.

Constants

KIND_EVENT

KIND_REQUEST

KIND_RESPONSE

MAX_FRAME_PAYLOAD

Hard cap matching transport.Conn read loop (64 MiB).