feat: Ghost Shell v2 — AGS v3 statusbar + violet-chaton v2 palette

- AGS v3.1.0 (Astal/GTK3) Ghost Shell avec ghost mode (heartbeat + hover reveal)
- Modules : clock, battery, volume (interactif), network, MPRIS, CPU/RAM, systray
- Brain Power panel (Super + B) — lecture live focus/todos/session
- tetardtek_ prompt avec curseur clignotant
- Palette violet-chaton v2 documentée (Mitsuri Kanroji gradient magenta → green)
- Autostart COSMIC via .desktop
- Archive AGS v1 conservée pour référence

ags-v3/app.ts

@@ -0,0 +1,30 @@
+import app from "ags/gtk3/app"
+import style from "./style.scss"
+import Heartbeat from "./widget/Heartbeat"
+import Bar from "./widget/Bar"
+import BrainPower from "./widget/panels/BrainPower"
+
+app.start({
+  css: style,
+  main() {
+    for (const monitor of app.get_monitors()) {
+      Heartbeat(monitor)
+      Bar(monitor)
+      BrainPower(monitor)
+    }
+  },
+  requestHandler(request: any, res: (response: any) => void) {
+    const cmd = String(request)
+    if (cmd.includes("toggle-brain")) {
+      const win = app.get_window("brain-power")
+      if (win) {
+        win.visible = !win.visible
+        res("toggled")
+      } else {
+        res("window not found")
+      }
+    } else {
+      res(`unknown: '${cmd}'`)
+    }
+  },
+})