test: end-to-end — a generated protocol crate runs a real round-trip

[Kinflou]

The whole pipeline, for real.

tests/fixtures/chat_project/src/chat.ids — a struct, an error, a protocol with a throwing request/response call and a one-way call:

protocol Chat {
    function send(text: str) -> Message ! Rejected;
    function note(text: str);
}

→ comline generate --target rust --mode lib via the actual binary → the emitted crate is compiled against comline-runtime → a hand-written driver runs ChatClient ⇆ ChatDispatcher over duplex():

• a request/response call (send("hi") -> Message),
• a raised Rejected reaching the client typed (CallError::App(ChatSendError::Rejected)),
• a one-way note("saved") landing on the provider.

Gap this surfaced (and fixed)

cli/Cargo.toml pinned comline-codegen-rust at the pre-protocol-codegen rev (a70cafcd — the core rev-bump), so comline generate still emitted the old bare-trait shape (fn send(text: String) -> Message;, no Dispatch, no Client, no comline-runtime dep). Bumped to comline-rust main (1191e76 — PRs #2–#4) and comline-codegen-typescript to its merged rev.

Cost

tests/cli/end_to_end.rs fetches + builds comline-runtime (~25s) and needs network — the price of a genuine end-to-end check. util.rs gains copy_fixture(name, temp); full suite 37 integration tests green.