feat: @timeout_ms codegen — Client::call_with_timeout

[Kinflou]

The codegen half of per-call settings, pairing with runtime#7.

protocol Api {
    @timeout_ms = 5000
    function slow(q: str) -> Reply;
}

→ the generated client method:

pub fn slow(&mut self, q: &str) -> Result<Reply, CallError<ApiSlowError>> {
    let (reply, fmt) = self.0.call_with_timeout(
        0u16, &ApiSlowParams { q }, core::time::Duration::from_millis(5000),
    )?;
    // ...
}

No annotation → self.0.call(...) as before. One-way functions ignore it (nothing to wait for). Only the client stub changes — trait, dispatcher, params struct untouched.

@timeout_ms is read from Function.parameters (a Property { name: "timeout_ms", expression }, frozen from the function annotation — core#46). An unparseable value is ignored (falls back to call).

Bumps the generated crate's comline-runtime pin to the rev with call_with_timeout.

Tests

tests/generate.rs — @timeout_ms = 2500 emits call_with_timeout(.., from_millis(2500)), an unannotated sibling stays on call. tests/compiles.rs gains an await_ack fn with @timeout_ms = 3000 so the compile-against-comline-runtime check exercises it. 7 string tests + 1 compile test green.

That closes the "deepen the generator" trio (borrowed args · one-way · per-call settings).