[LOW] No IDE integration (ACP/Zed explicitly not implemented)

[tuterx]

'claw acp serve' is a discoverability alias that prints 'not implemented'. Real CC has Agent Communication Protocol support.

Fix: Implement ACP JSON-RPC endpoint for IDE integration.

[1716775457damn]

ACP is foundational for IDE workflows. Even a minimal JSON-RPC endpoint routing to the existing agent would unlock Zed/VS Code integration. Starting with a single serve command and iterating beats waiting for a full implementation.