req(acp) - workflow runtime support for ACP servers

[davidkbainbridge]

I would like to see the introduction of an ACP based workflow runtime, so that conductor could leverage any runtime that supported an ACP interface and not only support new runtimes via code modifications. The ACP runtime could reference either an existing ACP server or a command to start a new sub-process as a server, example of leveraging copilot cli as a runtime.

workflow:
  runtime:
    provider:
      name: acp
      command: copilot
      args:
        - --acp
        - --yolo

An existing ACP server could be referenced by a URL as part of the provider configuration

workflow:
  runtime:
    provider:
      name: acp
      url: https://host:port/

[hertznsk]

This looks very promising! Having an ACP-based runtime would make it much easier to plug in external/local coding agents (like OpenCode, etc.) without relying on cloud-specific providers or custom adapters. I'd be happy to help test this out if someone puts together a PR.