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/.circleci/config.yml

@@ -0,0 +1,31 @@
+version: 2.1
+jobs:
+  build:
+    working_directory: ~/project
+    docker:
+      - image: bkuhlmann/alpine-ruby:latest
+    steps:
+      - checkout
+
+      - restore_cache:
+          name: Gems Restore
+          keys:
+            - gem-cache-{{.Branch}}-{{checksum "Gemfile"}}
+            - gem-cache-
+
+      - run:
+          name: Gems Install
+          command: |
+            gem update --system
+            bundle config set path "vendor/bundle"
+            bundle install
+
+      - save_cache:
+          name: Gems Store
+          key: gem-cache-{{.Branch}}-{{checksum "Gemfile"}}
+          paths:
+            - vendor/bundle
+
+      - run:
+          name: Rake
+          command: bundle exec rake