Initial commit — TANINUX (camel): management app + distro packaging

- app: GTK System Settings (tsettings) + Software Hub (thub) + TUI
- distro/: camel.toml manifest + MANIFEST.md (Arch + [tanin] repo model)
- packaging/: taninux, tanin-desktop (niri metapackage), tanin-greet,
  tanin-libadwaita, tanin-setup
- docs/, data/, LICENSE (GPL-3.0-or-later)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packaging/tanin-greet/dev/preview.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Preview tanin-greet from the repo in a nested cage window (no logout, no real
+# auth) and screenshot it. Uses the mock greetd socket so the UI fully renders.
+#   ./dev/preview.sh [wallpaper.jpg]
+set -euo pipefail
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+SOCK=/tmp/mock-greetd.sock
+SHOT=/tmp/tanin-greet.png
+
+export GREETD_SOCK="$SOCK"
+export TANIN_GREET_CSS="$HERE/tanin-greet.css"
+export TANIN_GREET_BG="${1:-$HOME/Downloads/karen-z-OW5F_DMfb0E-unsplash.jpg}"
+
+python3 "$HERE/dev/mockgreetd.py" "$SOCK" >/tmp/mockgreetd.log 2>&1 &
+MOCK=$!
+trap 'kill "$MOCK" 2>/dev/null; pkill -x cage 2>/dev/null' EXIT
+sleep 0.4
+
+timeout 8 cage -s -- python3 "$HERE/tanin-greet" >/tmp/tanin-greet.log 2>&1 &
+sleep 4.5
+grim -o "${GREET_OUTPUT:-DP-3}" "$SHOT" && echo "screenshot: $SHOT"
+pkill -x cage 2>/dev/null || true