[Roadmap] Phase 3 — Native probe backend (without separate GDB stub)

[ajlennon]

Summary

Support direct probe control (e.g. probe-rs, OpenOCD IPC) instead of requiring a TCP GDB server in front of the probe.

Implication

This is a new architecture path: not only an RSP TCP proxy — likely a Backend trait with multiple implementations.

Depends on

Stable requirements from Part A + Phase 1; avoid premature abstraction.

[ajlennon]

Update: #4 (session recording / rsgdb-record v1) is implemented on main. This item is unblocked for planning and implementation work.

[ajlennon]

Related open tracks: #10 session replay from JSONL, #11 richer SVD. Part A/B + CI (incl. Zephyr E2E) are green on main.

[ajlennon]

Baseline backend API landed on main:

• BackendTransport: tcp (default) vs native (returns NotImplemented until probe work exists)
• connect_backend(&ProxyConfig, &BackendConfig) -> Framed<BackendStream, GdbCodec> with BackendStream::Tcp today
• [backend] transport, CLI --transport, env RSGDB_TRANSPORT; backend_type is a free-form label
• Next step: implement Native with a real probe/session type and add variants to BackendStream as needed.