Transport behaviour for ACP agent runtimes.
This mirrors the pull-based ExMCP.Transport shape, but is named from the
agent side because stdio agents read from this process' stdin/stdout instead
of spawning a child process.
Transport behaviour for ACP agent runtimes.
This mirrors the pull-based ExMCP.Transport shape, but is named from the
agent side because stdio agents read from this process' stdin/stdout instead
of spawning a child process.