feat: add terminal input hook for extensions

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -1368,6 +1368,7 @@ export class InteractiveMode {
 			confirm: (title, message, opts) => this.showExtensionConfirm(title, message, opts),
 			input: (title, placeholder, opts) => this.showExtensionInput(title, placeholder, opts),
 			notify: (message, type) => this.showExtensionNotify(message, type),
+			onTerminalInput: (handler) => this.ui.addInputListener(handler),
 			setStatus: (key, text) => this.setExtensionStatus(key, text),
 			setWorkingMessage: (message) => {
 				if (this.loadingAnimation) {

packages/coding-agent/src/modes/rpc/rpc-mode.ts

@@ -144,6 +144,11 @@ export async function runRpcMode(session: AgentSession): Promise<never> {
 			} as RpcExtensionUIRequest);
 		},
 
+		onTerminalInput(): () => void {
+			// Raw terminal input not supported in RPC mode
+			return () => {};
+		},
+
 		setStatus(key: string, text: string | undefined): void {
 			// Fire and forget - no response needed
 			output({