fix(ansible): deploy.yml standalone redeploy now installs python3.12 prerequisite (#3538) (#3568)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mrveiss

autobot-slm-backend/ansible/deploy.yml

@@ -51,6 +51,12 @@
       when: "'frontend' in role_list"
 
     # AI/ML Roles
+    # python312 must be present before ai-stack creates its venv (#3538)
+    - name: Install Python 3.12 prerequisite for ai-stack
+      ansible.builtin.include_role:
+        name: python312
+      when: "'ai-stack' in role_list"
+
     - name: Deploy npu-worker role
       ansible.builtin.include_role:
         name: npu-worker