Flatten directory structure and update documentation

- Moved all files from mac_os/ subdirectory to repository root
- Updated README.adoc to reflect simplified architecture
- Updated QUICK_INSTALL.md with all current apps
- Added claude-cli to install.sh and bin/install_homebrew_formulas
- Repository now shows clean file structure without nested mac_os folder
- Documentation now accurately describes opinionated installer approach

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

CITATION.cff

@@ -0,0 +1,22 @@
+cff-version: 1.2.0
+message: Please use the following metadata when citing this project in your work.
+title: macOS
+abstract: Shell scripts for automated macOS machine setup.
+version: 22.0.0
+license: Hippocratic-2.1
+date-released: 2026-01-01
+authors:
+  - family-names: Kuhlmann
+    given-names: Brooke
+    affiliation: Alchemists
+    orcid: https://orcid.org/0000-0002-5810-6268
+keywords:
+ - bash
+ - shell
+ - scripts
+ - automation
+ - setup
+ - recovery
+repository-code: https://github.com/bkuhlmann/mac_os
+repository-artifact: https://alchemists.io/projects/mac_os
+url: https://alchemists.io/projects/mac_os