chore: add sproutclaw git workflow and track local extensions

Document main/upstream-sync/feature branch strategy, add sync/push
scripts, track .pi/agent extensions and webui in git, and disable
startup changelog via showChangelogOnStartup.

Co-authored-by: Cursor <cursoragent@cursor.com>

.pi/agent/extensions/webui/frontend/src/App.tsx

@@ -0,0 +1,33 @@
+import { BrowserRouter, Route, Routes } from "react-router-dom";
+import { PwaUpdatePrompt } from "./components/pwa/PwaUpdatePrompt";
+import { ChatLayout } from "./components/layout/ChatLayout";
+import { AvatarProvider } from "./context/AvatarContext";
+import { BootstrapProvider } from "./context/BootstrapContext";
+import { ChatProvider } from "./context/ChatContext";
+import { ChatPage } from "./routes/ChatPage";
+import { SettingsPage } from "./routes/SettingsPage";
+
+export function App() {
+	return (
+		<BrowserRouter>
+			<BootstrapProvider>
+				<AvatarProvider>
+					<Routes>
+						<Route
+							path="/"
+							element={
+								<ChatProvider>
+									<ChatLayout />
+								</ChatProvider>
+							}
+						>
+							<Route index element={<ChatPage />} />
+						</Route>
+						<Route path="/settings" element={<SettingsPage />} />
+					</Routes>
+					<PwaUpdatePrompt />
+				</AvatarProvider>
+			</BootstrapProvider>
+		</BrowserRouter>
+	);
+}