chore(hygiene): final script cleanup and plymouth optimization

- Remove unused pkg and cmd helper scripts
- Optimize Plymouth settings for cleaner boot in all environments
- Skip hardware auto-detection logic in Live ISO environment

bin/nomarchy-cmd-missing

@@ -1,11 +0,0 @@
-#!/bin/bash
-
-# Returns true if any of the commands passed in as arguments are missing on the system.
-
-for cmd in "$@"; do
-  if ! command -v "$cmd" &>/dev/null; then
-    exit 0
-  fi
-done
-
-exit 1

bin/nomarchy-on-boot

@@ -21,6 +21,11 @@ fi
 # 3. Declarative hardware configuration check (nixos-hardware)
 # This part ensures that if we are on an installed system, the correct
 # nixos-hardware module is selected in the configuration.
+# Skip this in the Live ISO environment
+if [[ $USER == "nixos" ]] || [[ -f /etc/nixos/hosts/live-iso.nix ]]; then
+    exit 0
+fi
+
 HW_FILE="/etc/nixos/hardware-selection.nix"
 if [ -w "$HW_FILE" ]; then
     PRODUCT_NAME=$(cat /sys/class/dmi/id/product_name 2>/dev/null || echo "Unknown")

bin/nomarchy-pkg-missing

@@ -1,15 +0,0 @@
-#!/usr/bin/env bash
-
-PKG_NAME="$1"
-
-if [ -z "$PKG_NAME" ]; then
-    echo "Usage: nomarchy-pkg-missing <package-name>"
-    exit 1
-fi
-
-nomarchy-pkg-present "$PKG_NAME"
-if [ $? -eq 0 ]; then
-    exit 1
-else
-    exit 0
-fi

bin/nomarchy-pkg-present

@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-
-PKG_NAME="$1"
-
-if [ -z "$PKG_NAME" ]; then
-    echo "Usage: nomarchy-pkg-present <package-name>"
-    exit 1
-fi
-
-STATE_FILE="$HOME/.config/home-manager/user-packages.json"
-
-if [ ! -f "$STATE_FILE" ]; then
-    exit 1
-fi
-
-if jq -e ". | index(\"$PKG_NAME\")" "$STATE_FILE" >/dev/null; then
-    exit 0
-else
-    exit 1
-fi