chore(repo): stop tracking build artifacts; add README, license metadata, ruff config

Untrack iso/out/ (3.4 GB ISO), packaging/*/pkg/ trees, *.pkg.tar.zst and
tanin-icons/src/ (529 files) and ignore them going forward. Files stay on
disk. NOTE: history still carries ~13 GiB of old ISO blobs — needs a
git filter-repo pass (see README/report).

Also: first README.md, license + license-files in pyproject, minimal ruff
config, demo scripts moved to scripts/demo/.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packaging/tanin-setup/pkg/tanin-setup/.PKGINFO

@@ -1,16 +0,0 @@
-# Generated by makepkg 7.1.0
-# using fakeroot version 1.37.2
-pkgname = tanin-setup
-pkgbase = tanin-setup
-xdata = pkgtype=pkg
-pkgver = 0.1.0-1
-pkgdesc = TANINUX first-run setup — seed user configs and enable the session portal
-url = https://taninux.kgva.ch
-builddate = 1781813718
-packager = Unknown Packager
-size = 2207
-arch = any
-license = GPL-3.0-or-later
-depend = systemd
-depend = xdg-desktop-portal
-depend = xdg-desktop-portal-gtk

packaging/tanin-setup/pkg/tanin-setup/usr/bin/tanin-setup

@@ -1,55 +0,0 @@
-#!/usr/bin/env bash
-# TANINUX first-run setup: seedet Default-Configs nach ~/.config und richtet
-# das Session-Portal ein (damit libadwaita-Apps Hell/Dunkel übernehmen).
-# Idempotent. --force überschreibt bestehende Configs (mit .bak-Backup).
-set -euo pipefail
-
-SKEL="/usr/share/tanin/skel"
-UNIT="/usr/share/tanin/tanin-session.target"
-CFG="${XDG_CONFIG_HOME:-$HOME/.config}"
-FORCE=0
-[ "${1:-}" = "--force" ] && FORCE=1
-
-seed_configs() {
-  [ -d "$SKEL" ] || return 0
-  while IFS= read -r -d '' src; do
-    rel="${src#"$SKEL"/}"
-    dst="$HOME/$rel"
-    mkdir -p "$(dirname "$dst")"
-    if [ -e "$dst" ] && [ "$FORCE" -eq 0 ]; then
-      continue
-    fi
-    [ -e "$dst" ] && cp -a "$dst" "$dst.bak" 2>/dev/null || true
-    cp -a "$src" "$dst"
-  done < <(find "$SKEL" -type f -print0)
-}
-
-install_session_target() {
-  [ -f "$UNIT" ] || return 0
-  install -Dm644 "$UNIT" "$CFG/systemd/user/tanin-session.target"
-  systemctl --user daemon-reload 2>/dev/null || true
-}
-
-# Apply the Fuji GTK theme for the current light/dark mode and enable the
-# follower service (tanin-libadwaita watch), so the appearance toggle in the
-# TANINUX settings retints every GTK3/GTK4 app live. Best-effort.
-enable_theme_follower() {
-  command -v tanin-libadwaita >/dev/null 2>&1 || return 0
-  tanin-libadwaita auto 2>/dev/null || true
-  systemctl --user enable --now tanin-libadwaita.service 2>/dev/null || true
-}
-
-seed_configs
-install_session_target
-enable_theme_follower
-
-cat <<'EOF'
-TANINUX setup complete.
-  • configs seeded into ~/.config (eww + niri)
-  • session target installed (~/.config/systemd/user/tanin-session.target)
-  • GTK theme applied + follower enabled (tanin-libadwaita.service)
-
-The shipped niri config already autostarts the session bits:
-  spawn-at-startup "dbus-update-activation-environment" "--systemd" "--all"
-  spawn-at-startup "systemctl" "--user" "start" "tanin-session.target"
-EOF

packaging/tanin-setup/pkg/tanin-setup/usr/share/tanin/tanin-session.target

@@ -1,7 +0,0 @@
-[Unit]
-Description=TANINUX graphical session
-# Startet (per Dependency-Request) graphical-session.target, an dem
-# xdg-desktop-portal hängt — sonst kann das Portal nicht aktivieren und
-# libadwaita-Apps (Nautilus …) bleiben im Hell-Fallback.
-Requires=graphical-session.target
-After=graphical-session.target