New crate wrapping agent-client-protocol 2.1 in the client role. spawn()
resolves claude-code-acp on the PATH the child would run with, starts it
in the session cwd with the session env, runs initialize + session/new,
and returns an AcpSession holding the connection, the ACP session id,
and an unbounded channel of raw session/update notifications for #135.
initialize declares fs.readTextFile, fs.writeTextFile and terminal as
false so the adapter uses Claude Code's own tools. request_permission is
a stub that declines until #139.
terminate() sends session/cancel, waits, SIGTERMs, then SIGKILLs. The
child stays in the daemon's process group and gets SIGTERM on daemon
death via PR_SET_PDEATHSIG. CLAUDECODE is stripped from the child env:
the adapter refuses to start when it believes it is nested in another
Claude Code session, which is how a daemon launched from one behaves.
Tests run against tests/fake_acp_agent.py, a JSON-RPC-over-stdio stand-in
that logs what it receives; real_adapter_handshake is #[ignore]d.
Miguel Palhas
540a3025b1