Roles only run on intended supported OS, and minor cleanup of when statements to match

roles/ensure_repo_rpmfusion/tasks/main.yml

@@ -1,7 +1,17 @@
 ---
 # tasks file for ensure_repo_rpmfusion
+- name: Assert Target OS Is Supported
+  when:
+    - ansible_facts["system"] is defined
+  ansible.builtin.assert:
+    fail_msg: "Unsupported OS: {{ ansible_facts['distribution'] | default('unknown') }}"
+    quiet: true
+    that:
+      - ansible_facts["system"] == 'Linux'
+      - >-
+        ansible_facts["distribution"] in ['AlmaLinux', 'CentOS', 'Debian',
+        'Fedora', 'OracleLinux', 'Rocky', 'Ubuntu']
 - name: Include Variables
-  when: ["ansible_facts[\"system\"] == 'Linux'"]
   ansible.builtin.include_vars:
     file: '{{ lookup("first_found", findme) }}'
     name: ensure_repo_rpmfusion
@@ -23,17 +33,14 @@
       errors: ignore
 - name: Package Discovery
   when:
-    - ansible_facts["system"] == 'Linux'
     - ansible_facts["packages"] is not defined
   ansible.builtin.package_facts:
 - name: Service Discovery
   when:
-    - ansible_facts["system"] == 'Linux'
     - ansible_facts["services"] is not defined
   ansible.builtin.service_facts:
 - name: Ensure Packages
   when:
-    - ansible_facts["system"] == 'Linux'
     - ensure_repo_rpmfusion is defined
     - ensure_repo_rpmfusion.package_list is defined
     - ensure_repo_rpmfusion.package_list is iterable
@@ -50,7 +57,6 @@
     - Ensure_Repo_Rpmfusion.Service_Facts
 - name: Ensure Services
   when:
-    - ansible_facts["system"] == 'Linux'
     - ensure_repo_rpmfusion is defined
     - ensure_repo_rpmfusion.service_list is defined
     - ensure_repo_rpmfusion.service_list is iterable
@@ -66,3 +72,22 @@
     - Ensure_Repo_Rpmfusion.Service_Facts
 - name: Flush Handlers
   ansible.builtin.meta: flush_handlers
+- name: Post Verification Package Discovery
+  when:
+    - ensure_repo_rpmfusion is defined
+    - ensure_repo_rpmfusion.package_list is defined
+    - ensure_repo_rpmfusion.package_list is iterable
+  ansible.builtin.package_facts:
+- name: Assert Managed Packages Are Installed
+  when:
+    - ensure_repo_rpmfusion is defined
+    - ensure_repo_rpmfusion.package_list is defined
+    - ensure_repo_rpmfusion.package_list is iterable
+  ansible.builtin.assert:
+    fail_msg: "Package {{ item.name }} is not installed"
+    quiet: true
+    that:
+      - item.state != 'present' or ansible_facts['packages'][item.name] is defined
+  loop: "{{ ensure_repo_rpmfusion.package_list }}"
+  loop_control:
+    label: "{{ item.name }} will be verified"