feat(coding-agent): print resume hint on interactive exit

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

@@ -47,6 +47,7 @@ import {
 	TUI,
 	visibleWidth,
 } from "@earendil-works/pi-tui";
+import chalk from "chalk";
 import { spawn, spawnSync } from "child_process";
 import {
 	APP_NAME,
@@ -194,6 +195,28 @@ function isUnknownModel(model: Model<any> | undefined): boolean {
 	return !!model && model.provider === "unknown" && model.id === "unknown" && model.api === "unknown";
 }
 
+function quoteIfNeeded(value: string): string {
+	if (value.length > 0 && !/[^a-zA-Z0-9_\-./~:@]/.test(value)) {
+		return value;
+	}
+	return `'${value.replace(/'/g, `'\\''`)}'`;
+}
+
+export function formatResumeCommand(sessionManager: SessionManager): string | undefined {
+	if (!process.stdout.isTTY) return undefined;
+	if (!sessionManager.isPersisted()) return undefined;
+
+	const sessionFile = sessionManager.getSessionFile();
+	if (!sessionFile || !fs.existsSync(sessionFile)) return undefined;
+
+	const args = [APP_NAME];
+	if (!sessionManager.usesDefaultSessionDir()) {
+		args.push("--session-dir", quoteIfNeeded(sessionManager.getSessionDir()));
+	}
+	args.push("--session", sessionManager.getSessionId());
+	return args.join(" ");
+}
+
 function hasDefaultModelProvider(providerId: string): providerId is keyof typeof defaultModelPerProvider {
 	return providerId in defaultModelPerProvider;
 }
@@ -3276,6 +3299,12 @@ export class InteractiveMode {
 
 		this.stop();
 		await this.runtimeHost.dispose();
+
+		const resumeCommand = formatResumeCommand(this.sessionManager);
+		if (resumeCommand) {
+			process.stdout.write(`  ${chalk.dim("To resume this session:")} ${resumeCommand}\n`);
+		}
+
 		process.exit(0);
 	}