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/lib/brain.ts

@@ -0,0 +1,73 @@
+import GLib from "gi://GLib"
+
+const BRAIN_ROOT = "/home/tetardtek/Dev/Cortex-Template"
+
+export interface BrainState {
+  focus: string
+  todos: { open: number; done: number; top3: string[] }
+  session: string | null
+}
+
+function readFile(path: string): string | null {
+  try {
+    const [ok, contents] = GLib.file_get_contents(path)
+    if (ok && contents) {
+      return new TextDecoder().decode(contents)
+    }
+  } catch {}
+  return null
+}
+
+export function getFocus(): string {
+  const content = readFile(`${BRAIN_ROOT}/focus.md`)
+  if (!content) return "no focus"
+  // skip header lines, get the meat
+  const lines = content.split("\n").filter(
+    (l) => !l.startsWith("#") && !l.startsWith(">") && l.trim() !== "" && !l.startsWith("---")
+  )
+  return lines[0]?.trim() || "no focus"
+}
+
+export function getTodos(): { open: number; done: number; top3: string[] } {
+  const content = readFile(`${BRAIN_ROOT}/todo/README.md`)
+  if (!content) return { open: 0, done: 0, top3: [] }
+
+  const lines = content.split("\n")
+  const open: string[] = []
+  let done = 0
+
+  for (const line of lines) {
+    const trimmed = line.trim()
+    if (trimmed.startsWith("- [ ]") || trimmed.startsWith("⬜")) {
+      open.push(trimmed.replace(/^- \[ \] /, "").replace(/^⬜ ?/, ""))
+    } else if (trimmed.startsWith("- [x]") || trimmed.startsWith("✅")) {
+      done++
+    }
+  }
+
+  return {
+    open: open.length,
+    done,
+    top3: open.slice(0, 3),
+  }
+}
+
+export function getSession(): string | null {
+  try {
+    const [ok, contents] = GLib.file_get_contents(
+      GLib.get_home_dir() + "/.claude/session-role"
+    )
+    if (ok && contents) {
+      return new TextDecoder().decode(contents).trim()
+    }
+  } catch {}
+  return null
+}
+
+export function getBrainState(): BrainState {
+  return {
+    focus: getFocus(),
+    todos: getTodos(),
+    session: getSession(),
+  }
+}