feat(rpc): add validated desktop Pi RPC command palette

src/protocol/index.js

@@ -1,4 +1,5 @@
 import path from "node:path";
+import { validatePiRpcCommand } from "../bridge/pi-rpc-command-spec.js";
 
 export const PROTOCOL_VERSION = "v1";
 export const MAX_FRAME_BYTES = 64 * 1024;
@@ -37,6 +38,7 @@ const requestOperations = new Map([
 	["compact", { agent: true, payload: "compact" }],
 	["set_model", { agent: true, payload: "model" }],
 	["set_thinking_level", { agent: true, payload: "thinking" }],
+	["pi_rpc_command", { agent: true, payload: "piRpcCommand" }],
 ]);
 
 const eventTypes = new Set([
@@ -275,6 +277,17 @@ function validatePayload(kind, value) {
 				);
 			return { level };
 		}
+		case "piRpcCommand": {
+			assertAllowedKeys(payload, new Set(["command", "input"]), "payload");
+			const command = assertString(payload.command, "payload.command", {
+				maxLength: 64,
+			});
+			try {
+				return { command, input: validatePiRpcCommand(command, payload.input) };
+			} catch (error) {
+				throw new ProtocolError("invalid_message", error.message);
+			}
+		}
 		default:
 			throw new ProtocolError("invalid_message", "unsupported payload shape");
 	}