feat: add ACP (Agent Client Protocol) server support#29
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Add orcs-acp crate implementing the ACP Agent trait from agent-client-protocol v0.9. Enables ORCS to run as an ACP-compatible agent over stdio, registerable in ACP-aware editors (Zed, JetBrains). P1 implementation: initialize, authenticate, new_session, prompt, cancel handlers with echo response. Engine integration planned for P2. CLI: `orcs --acp` starts the ACP server mode.
Replace echo-based engine_worker with real ORCS engine integration. The ACP server now sends user prompts through IOInputHandle and streams engine output back as ACP SessionUpdate notifications, using the same idle-timeout pattern as run_command().
Track pending approval IDs from ShowApprovalRequest and attach them as InputContext when the next prompt is a HIL response (y/n), enabling the engine's IOBridge to dispatch correct approve/reject signals. Add comprehensive tests for convert and server modules.
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Summary
orcs-acpcrate implementing an ACP-compliant server that exposes the ORCS engine over HTTP (JSON-RPC style)IOInput/IOOutputchannels, enabling external clients to send user input and receive engine outputChanges
New crate:
orcs-acpserver.rs— ACP HTTP server built onagent-client-protocolcrate. Handles session lifecycle, message routing, and streaming responsesagent.rs— ACP agent implementation bridging ACP protocol messages to ORCS engineIOInput/IOOutputconvert.rs— Type conversion between ACP protocol types and ORCS internal typesModified
orcs-cli/src/main.rs— Add--acpflag to start the ACP server alongside the CLIorcs-app/src/app/mod.rs— Expose IO channel constructors for ACP integrationTest plan
orcs --acpstarts ACP server on default port