Initial setup: mac_os installer with custom config

Contains both components needed for Mac setup:
- mac_os/: Installer scripts (from bkuhlmann/mac_os)
- mac_os-config/: Custom app configuration

Configured apps:
- Homebrew formulas: atuin, bash, ffmpeg, mas, mole, node, rename, ykman
- Homebrew casks: chromium, deepl, element, nextcloud, nova, proton suite, signal, transmit
- App Store: Affinity suite, Bitwarden, Final Cut Pro, Invoice Ninja, iWork, PastePal, xSearch

Usage: cd mac_os && ./bin/run

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mac_os-config/lib/settings.sh

@@ -0,0 +1,19 @@
+#! /usr/bin/env bash
+
+# Defines global settings.
+
+# General
+set -o nounset
+set -o errexit
+set -o pipefail
+IFS=$'\n\t'
+
+# Homebrew
+export HOMEBREW_CURL_RETRIES=3
+
+# Custom Applications
+# Add app URLs and names here for apps not available via Homebrew or App Store.
+# Example:
+# export MY_APP_NAME="MyApp.app"
+# export MY_APP_URL="https://example.com/download/myapp.dmg"
+# export MY_APP_VOLUME_NAME="MyApp"