feat(arch-layer,scripts): linux-gated desktop configs + package install scripts

niri (exact_config.d, scripts), noctalia (plugins excluded — runtime
state with embedded token), fontconfig, mimeapps.list,
niri-dynamic-workspaces, systemd user unit files (enable-state not
managed; only nirinit enabled by run_once), niri-launch vendored from
/usr/bin (unowned hand-written script, shellcheck warnings pre-existing).

Scripts: packages (pacman --needed + paru, brew on darwin, root-safe,
keyed on packages.yaml hash), gh extensions (idempotent), user services
(linux), post (tpm clone, bat cache, fc-cache). All shellcheck-clean.

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

dot_local/bin/executable_niri-launch

@@ -0,0 +1,88 @@
+#!/bin/bash
+APP=$1
+declare -a INSTANCES
+
+# Per-class launch commands for kitty-* (class -> command run via `kitty -e`).
+# Unmapped classes just open a plain kitty with that class.
+declare -A KITTY_CMDS=(
+    # [kitty-lazygit]="lazygit"
+    # [kitty-btop]="btop"
+)
+
+# Handle webapp cycling and launching
+if [[ "$APP" == "webapp" ]]; then
+    # Cycle through all WebApps
+    INSTANCES=($(niri msg -j windows | jq -r '.[] | select(.app_id | startswith("WebApp-")) | .id'))
+elif [[ "$APP" == webapp-* ]]; then
+    # Extract the webapp name (e.g., "webapp-claude" -> "Claude")
+    WEBAPP_NAME=$(echo "$APP" | sed 's/webapp-//' | sed 's/.*/\u&/')
+    # Find matching WebApp by prefix (case-insensitive match)
+    APP_ID=$(niri msg -j windows | jq -r ".[] | select(.app_id | test(\"WebApp-${WEBAPP_NAME}\"; \"i\")) | .app_id" | head -1)
+
+    if [ -z "$APP_ID" ]; then
+        # No instance running, launch via gtk-launch
+        DESKTOP_FILE=$(find ~/.local/share/applications -name "WebApp-${WEBAPP_NAME}*.desktop" -print -quit 2>/dev/null)
+        if [ -n "$DESKTOP_FILE" ]; then
+            gtk-launch "$(basename "$DESKTOP_FILE")"
+        else
+            echo "No desktop file found for WebApp-${WEBAPP_NAME}"
+        fi
+        exit 0
+    fi
+
+    INSTANCES=($(niri msg -j windows | jq -r ".[] | select(.app_id | test(\"WebApp-${WEBAPP_NAME}\"; \"i\")) | .id"))
+elif [[ "$APP" == "kitty" ]]; then
+    # Cycle through ALL kitty windows (any class: kitty, kitty-nvim, ...)
+    INSTANCES=($(niri msg -j windows | jq -r '.[] | select((.app_id // "") | ascii_downcase | startswith("kitty")) | .id'))
+elif [[ "$APP" == kitty-* ]]; then
+    # Specific kitty class, e.g. kitty-nvim -> app_id "kitty-nvim"
+    INSTANCES=($(niri msg -j windows | jq -r --arg cls "$APP" \
+        '.[] | select((.app_id // "") | ascii_downcase == ($cls | ascii_downcase)) | .id'))
+
+    if [ ${#INSTANCES[@]} -eq 0 ]; then
+        cmd="${KITTY_CMDS[$APP]:-}"
+        if [ -n "$cmd" ]; then
+            niri msg action spawn -- kitty --class "$APP" -e $cmd
+        else
+            niri msg action spawn -- kitty --class "$APP"
+        fi
+        exit 0
+    fi
+elif [[ "$APP" == "ghostty" ]]; then
+    # Cycle through Ghostty terminals (case-insensitive app_id match)
+    INSTANCES=($(niri msg -j windows | jq -r '.[] | select(.app_id | test("ghostty"; "i")) | .id'))
+else
+    INSTANCES=($(niri msg -j windows | jq -r ".[] | select(.app_id==\"${APP}\") | .id"))
+fi
+
+# Launch if no instances
+if [ ${#INSTANCES[@]} -eq 0 ]; then
+    # Removed "kitty" from this block so it falls through to the spawn command
+    if [[ "$APP" == "webapp" || "$APP" == "ghostty" ]]; then
+        echo "No ${APP} windows running"
+        exit 0
+    fi
+    niri msg action spawn -- $APP
+    exit 0
+fi
+
+# Focus logic
+if [ ${#INSTANCES[@]} -eq 1 ]; then
+    niri msg action focus-window --id ${INSTANCES[0]}
+else
+    ISORTED=($(printf "%s\n" "${INSTANCES[@]}" | sort -n))
+    FOCUSED=$(niri msg -j focused-window | jq '.id')
+
+    if [[ ! " ${ISORTED[@]} " =~ ${FOCUSED} ]]; then
+        niri msg action focus-window --id ${ISORTED[0]}
+    else
+        new_index=0
+        for i in "${!ISORTED[@]}"; do
+            if [ "${ISORTED[$i]}" -eq "${FOCUSED}" ]; then
+                new_index=$(( (i + 1) % ${#ISORTED[@]} ))
+                break
+            fi
+        done
+        niri msg action focus-window --id ${ISORTED[$new_index]}
+    fi
+fi