Add --skip-welcome flag to web server and serve script

The serve script now opens with ?skip-sessions-welcome to bypass
the sign-in overlay during manual testing.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

scripts/code-sessions-web.js

@@ -15,7 +15,7 @@ const APP_ROOT = path.join(__dirname, '..');
 
 async function main() {
 	const args = minimist(process.argv.slice(2), {
-		boolean: ['help', 'no-open'],
+		boolean: ['help', 'no-open', 'skip-welcome'],
 		string: ['host', 'port'],
 	});
 
@@ -86,7 +86,8 @@ async function main() {
 	server.listen(PORT, HOST, () => {
 		console.log(`\n  Sessions Web running at: http://${HOST}:${PORT}/\n`);
 		if (!args['no-open'] && args.open !== false) {
-			open.default(`http://${HOST}:${PORT}/`);
+			const query = args['skip-welcome'] ? '?skip-sessions-welcome' : '';
+			open.default(`http://${HOST}:${PORT}/${query}`);
 		}
 	});
 

src/vs/sessions/test/e2e/package.json

@@ -4,6 +4,7 @@
 	"private": true,
 	"description": "Automated E2E tests for the Agent Sessions window using playwright-cli",
 	"scripts": {
+		"serve": "node ../../../../../scripts/code-sessions-web.js --port 9222 --skip-welcome",
 		"generate": "node generate.cjs",
 		"test": "node test.cjs"
 	},