feat: add terminal input hook for extensions

packages/coding-agent/src/core/extensions/index.ts

@@ -123,6 +123,7 @@ export type {
 	SetLabelHandler,
 	SetModelHandler,
 	SetThinkingLevelHandler,
+	TerminalInputHandler,
 	// Events - Tool
 	ToolCallEvent,
 	ToolCallEventResult,

packages/coding-agent/src/core/extensions/runner.ts

@@ -170,6 +170,7 @@ const noOpUIContext: ExtensionUIContext = {
 	confirm: async () => false,
 	input: async () => undefined,
 	notify: () => {},
+	onTerminalInput: () => () => {},
 	setStatus: () => {},
 	setWorkingMessage: () => {},
 	setWidget: () => {},

packages/coding-agent/src/core/extensions/types.ts

@@ -97,6 +97,9 @@ export interface ExtensionWidgetOptions {
 	placement?: WidgetPlacement;
 }
 
+/** Raw terminal input listener for extensions. */
+export type TerminalInputHandler = (data: string) => { consume?: boolean; data?: string } | undefined;
+
 /**
  * UI context for extensions to request interactive UI.
  * Each mode (interactive, RPC, print) provides its own implementation.
@@ -114,6 +117,9 @@ export interface ExtensionUIContext {
 	/** Show a notification to the user. */
 	notify(message: string, type?: "info" | "warning" | "error"): void;
 
+	/** Listen to raw terminal input (interactive mode only). Returns an unsubscribe function. */
+	onTerminalInput(handler: TerminalInputHandler): () => void;
+
 	/** Set status text in the footer/status bar. Pass undefined to clear. */
 	setStatus(key: string, text: string | undefined): void;