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/styles/_bar.scss

@@ -0,0 +1,133 @@
+@use "palette" as *;
+
+// Layer 1 — Ghost bar (hover reveal)
+// GTK CSS alpha() must be unquoted strings to pass through SCSS compiler
+
+window.Bar {
+  background: transparent;
+
+  > centerbox {
+    background: rgba(38, 21, 55, 0.88);  // $base @ 0.88
+    border-radius: $radius;
+    border: 3px solid rgba(255, 77, 166, 0.60);  // $magenta @ 0.60
+    margin: 6px 8px;
+    padding: 0 8px;
+    min-height: 38px;
+  }
+
+  .modules-left,
+  .modules-center,
+  .modules-right {
+    padding: 0 4px;
+  }
+
+  .module {
+    padding: 0 8px;
+    color: $text;
+
+    &:hover {
+      color: $lilac;
+    }
+  }
+
+  .separator {
+    color: rgba(240, 234, 248, 0.12);  // $text @ 0.12
+    font-size: 11px;
+    padding: 0 4px;
+    font-weight: normal;
+  }
+
+  // ── clock ──
+  .clock {
+    color: $magenta;
+    font-weight: 900;
+    font-size: 14px;
+    letter-spacing: 0.04em;
+    padding: 0 10px;
+
+    &:hover { color: $lilac; }
+  }
+
+  .date {
+    color: $lavande;
+    font-size: 12px;
+    font-weight: normal;
+    padding: 0 10px 0 2px;
+  }
+
+  // ── system ──
+  .cpu { color: $lavande; }
+  .ram { color: $magenta; }
+  .temp {
+    color: rgba(164, 180, 255, 0.60);  // $lavande @ 0.60
+    font-size: 11px;
+    font-weight: normal;
+  }
+
+  .cpu, .ram, .temp {
+    &.warning { color: $champagne; }
+    &.critical { color: $danger; }
+  }
+
+  // ── network ──
+  .network {
+    color: $lavande;
+    font-size: 12px;
+    &.disconnected { color: $danger; }
+  }
+
+  // ── volume ──
+  .volume {
+    color: $magenta;
+    &.muted { color: rgba(255, 77, 166, 0.30); }
+  }
+
+  // ── battery ──
+  .battery {
+    color: $magenta;
+    &.charging { color: $mitsuri; }
+    &.low { color: $danger; }
+    &.warning { color: $champagne; }
+  }
+
+  // ── media ──
+  .media {
+    color: $lilac;
+    font-size: 12px;
+    font-weight: normal;
+    padding: 0 10px;
+
+    &.paused {
+      color: rgba(201, 160, 255, 0.50);  // $lilac @ 0.50
+      font-style: italic;
+    }
+  }
+
+  // ── systray ──
+  .systray {
+    padding: 0 6px;
+  }
+
+  // ── workspaces ──
+  .workspaces button {
+    background: transparent;
+    color: $muted;
+    min-width: 22px;
+    min-height: 22px;
+    border-radius: $radius-sm;
+    margin: 2px;
+    padding: 0;
+
+    &.active {
+      background: rgba(255, 77, 166, 0.20);
+      color: $magenta;
+      border: 1px solid rgba(255, 77, 166, 0.40);
+    }
+
+    &.occupied { color: $lilac; }
+    &:hover {
+      background: rgba(201, 160, 255, 0.12);
+      color: $lilac;
+    }
+  }
+}

ags-v3/styles/_heartbeat.scss

@@ -0,0 +1,21 @@
+@use "palette" as *;
+
+// Layer 0 — heartbeat line
+// Fin trait magenta en haut de l'écran — "le système est vivant"
+
+window.Heartbeat {
+  background: transparent;
+
+  > box {
+    // gradient uses rgba() which SCSS understands natively
+    background: linear-gradient(
+      to right,
+      rgba(255, 77, 166, 0.0),
+      rgba(255, 77, 166, 0.6),
+      rgba(201, 160, 255, 0.8),
+      rgba(255, 77, 166, 0.6),
+      rgba(255, 77, 166, 0.0)
+    );
+    min-height: 2px;
+  }
+}

ags-v3/styles/_palette.scss

@@ -0,0 +1,35 @@
+// ── violet-chaton v2 ──────────────────────────────────────────────────────
+// Mitsuri Kanroji inspired — gradient magenta → green
+// Ghost Shell edition
+
+// backgrounds
+$crust:     #1a0e27;
+$base:      #261537;
+$mantle:    #341c4a;
+$surface0:  #3d2454;
+$surface1:  #493161;
+$surface2:  #5a3875;
+
+// accents
+$magenta:   #ff4da6;
+$lilac:     #c9a0ff;
+$mitsuri:   #9adba8;
+$lavande:   #a4b4ff;
+$champagne: #e8c87a;
+$danger:    #f25c7a;
+
+// text
+$text:      #f0eaf8;
+$subtext1:  #c4b8d4;
+$subtext0:  #9a8fad;
+$muted:     #716686;
+
+// shared
+$font:      "Maple Mono NF", "MapleMono Nerd Font", monospace;
+$radius:    14px;
+$radius-sm: 8px;
+$transition: 300ms ease-out;
+
+// Note: alpha() is a GTK CSS function, not SCSS.
+// Use it raw in GTK CSS values, not in SCSS variables.
+// For SCSS variables that need transparency, use rgba().