fold omp runtime config and remaining pi extensions into source

dot_pi/agent/extensions/private_notify.ts

@@ -0,0 +1,37 @@
+/**
+ * Pi Notify Extension (with audible bell)
+ *
+ * Fires a terminal bell + native desktop notification when Pi finishes.
+ * - Bell (\x07): tmux flags the window in the status bar + audible ding
+ * - OSC 777: Ghostty, iTerm2, WezTerm desktop notification popup
+ * - OSC 99: Kitty desktop notification popup
+ *
+ * Based on the official example from earendil-works/pi, with bell added.
+ */
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+
+function notifyOSC777(title: string, body: string): void {
+  process.stdout.write(`\x1b]777;notify;${title};${body}\x07`);
+}
+
+function notifyOSC99(title: string, body: string): void {
+  process.stdout.write(`\x1b]99;i=1:d=0;${title}\x1b\\`);
+  process.stdout.write(`\x1b]99;i=1:p=body;${body}\x1b\\`);
+}
+
+function notify(title: string, body: string): void {
+  // Audible bell — tmux catches this, flags the window, terminal dings
+  process.stdout.write("\x07");
+  // Desktop notification popup (OSC 777 for Ghostty, OSC 99 for Kitty)
+  if (process.env.KITTY_WINDOW_ID) {
+    notifyOSC99(title, body);
+  } else {
+    notifyOSC777(title, body);
+  }
+}
+
+export default function (pi: ExtensionAPI) {
+  pi.on("agent_end", async () => {
+    notify("Pi", "Task complete — ready for input");
+  });
+}