refactor: modularize cli helpers

src/cli/prompt.ts

@@ -0,0 +1,21 @@
+import readline from "node:readline/promises";
+import { stdin as input, stdout as output } from "node:process";
+
+import { isVerbose, isYes } from "../globals.js";
+
+export async function promptYesNo(
+	question: string,
+	defaultYes = false,
+): Promise<boolean> {
+	// Simple Y/N prompt honoring global --yes and verbosity flags.
+	if (isVerbose() && isYes()) return true; // redundant guard when both flags set
+	if (isYes()) return true;
+	const rl = readline.createInterface({ input, output });
+	const suffix = defaultYes ? " [Y/n] " : " [y/N] ";
+	const answer = (await rl.question(`${question}${suffix}`))
+		.trim()
+		.toLowerCase();
+	rl.close();
+	if (!answer) return defaultYes;
+	return answer.startsWith("y");
+}