fixes #161: disable theme watcher in print mode

The theme file watcher was keeping the Node.js process alive indefinitely
even in print mode where hot-reload is unnecessary. This fix adds an
enableWatcher parameter to initTheme() and setTheme() functions, and only
enables watchers in interactive mode.

- Modified initTheme() to accept enableWatcher parameter (default: false)
- Modified setTheme() to accept enableWatcher parameter (default: false)
- Updated main.ts to only enable watchers in interactive mode
- Updated InteractiveMode to enable watchers when changing themes

packages/coding-agent/src/main.ts

@@ -167,10 +167,13 @@ export async function main(args: string[]) {
 	// Process @file arguments
 	const { initialMessage, initialAttachments } = prepareInitialMessage(parsed);
 
+	// Determine if we're in interactive mode (needed for theme watcher)
+	const isInteractive = !parsed.print && parsed.mode === undefined;
+
 	// Initialize theme (before any TUI rendering)
 	const settingsManager = new SettingsManager();
 	const themeName = settingsManager.getTheme();
-	initTheme(themeName);
+	initTheme(themeName, isInteractive);
 
 	// Setup session manager
 	const sessionManager = new SessionManager(parsed.continue && !parsed.resume, parsed.session);
@@ -196,7 +199,6 @@ export async function main(args: string[]) {
 	}
 
 	// Determine mode and output behavior
-	const isInteractive = !parsed.print && parsed.mode === undefined;
 	const mode = parsed.mode || "text";
 	const shouldPrintMessages = isInteractive;
 

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

@@ -1164,7 +1164,7 @@ export class InteractiveMode {
 			const selector = new ThemeSelectorComponent(
 				currentTheme,
 				(themeName) => {
-					const result = setTheme(themeName);
+					const result = setTheme(themeName, true);
 					this.settingsManager.setTheme(themeName);
 					this.ui.invalidate();
 					done();
@@ -1179,7 +1179,7 @@ export class InteractiveMode {
 					this.ui.requestRender();
 				},
 				(themeName) => {
-					const result = setTheme(themeName);
+					const result = setTheme(themeName, true);
 					if (result.success) {
 						this.ui.invalidate();
 						this.ui.requestRender();

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

@@ -455,12 +455,14 @@ let currentThemeName: string | undefined;
 let themeWatcher: fs.FSWatcher | undefined;
 let onThemeChangeCallback: (() => void) | undefined;
 
-export function initTheme(themeName?: string): void {
+export function initTheme(themeName?: string, enableWatcher: boolean = false): void {
 	const name = themeName ?? getDefaultTheme();
 	currentThemeName = name;
 	try {
 		theme = loadTheme(name);
+		if (enableWatcher) {
 			startThemeWatcher();
+		}
 	} catch (error) {
 		// Theme is invalid - fall back to dark theme silently
 		currentThemeName = "dark";
@@ -469,11 +471,13 @@ export function initTheme(themeName?: string): void {
 	}
 }
 
-export function setTheme(name: string): { success: boolean; error?: string } {
+export function setTheme(name: string, enableWatcher: boolean = false): { success: boolean; error?: string } {
 	currentThemeName = name;
 	try {
 		theme = loadTheme(name);
+		if (enableWatcher) {
 			startThemeWatcher();
+		}
 		return { success: true };
 	} catch (error) {
 		// Theme is invalid - fall back to dark theme