Focus local lab deployment on Linux and WSL

ansible/roles/preflight/tasks/main.yml

@@ -1,56 +1,14 @@
 - name: Classify supported host profile
   set_fact:
-    courseware_is_macos: "{{ ansible_system == 'Darwin' }}"
     courseware_is_linux: "{{ ansible_system == 'Linux' }}"
     courseware_is_wsl: "{{ 'microsoft' in ansible_kernel | lower or 'wsl' in ansible_kernel | lower }}"
     courseware_is_native_linux: "{{ ansible_system == 'Linux' and not ('microsoft' in ansible_kernel | lower or 'wsl' in ansible_kernel | lower) }}"
-    courseware_host_profile: "{{ 'macos' if ansible_system == 'Darwin' else ('wsl' if ('microsoft' in ansible_kernel | lower or 'wsl' in ansible_kernel | lower) else ('native-debian-ubuntu' if ansible_system == 'Linux' and ansible_os_family == 'Debian' else 'unsupported')) }}"
+    courseware_host_profile: "{{ 'wsl' if ansible_system == 'Linux' and ('microsoft' in ansible_kernel | lower or 'wsl' in ansible_kernel | lower) else ('native-debian-ubuntu' if ansible_system == 'Linux' and ansible_os_family == 'Debian' else 'unsupported') }}"
 
 - name: Fail on unsupported operating systems
   fail:
-    msg: "Supported platforms are Apple Silicon macOS and Debian-family Linux/WSL."
-  when: ansible_system not in ["Darwin", "Linux"]
-
-- name: Fail on unsupported macOS architecture
-  fail:
-    msg: "This installer supports Apple Silicon Macs only."
-  when:
-    - ansible_system == "Darwin"
-    - ansible_architecture not in ["arm64", "aarch64"]
-
-- name: Fail on undersized macOS systems
-  fail:
-    msg: "This courseware assumes a modern Apple Silicon Mac with at least 16 GB of unified memory."
-  when:
-    - ansible_system == "Darwin"
-    - (ansible_memtotal_mb | int) < 16000
-
-- name: Check for Xcode command line tools
-  command: xcode-select -p
-  register: courseware_xcode_select
-  changed_when: false
-  when: ansible_system == "Darwin"
-
-- name: Check for Homebrew
-  command: which brew
-  register: courseware_brew_check
-  changed_when: false
-  failed_when: false
-  when: ansible_system == "Darwin"
-
-- name: Fail when Xcode command line tools are missing
-  fail:
-    msg: "Install Xcode Command Line Tools first with 'xcode-select --install'."
-  when:
-    - ansible_system == "Darwin"
-    - courseware_xcode_select.rc != 0
-
-- name: Fail when Homebrew is missing
-  fail:
-    msg: "Install Homebrew first from https://brew.sh/."
-  when:
-    - ansible_system == "Darwin"
-    - courseware_brew_check.rc != 0
+    msg: "Supported platforms are Debian-family Linux and WSL."
+  when: courseware_host_profile == "unsupported"
 
 - name: Fail on unsupported Linux family
   fail:
@@ -330,6 +288,5 @@
 
 - name: Set runtime binary defaults
   set_fact:
-    courseware_python_bin: >-
-      {{ '/opt/homebrew/opt/python@3.11/bin/python3.11' if ansible_system == 'Darwin' else '/usr/bin/python3' }}
+    courseware_python_bin: "/usr/bin/python3"
     courseware_ollama_bin: "ollama"