feat(ci): optimize Molecule VM creation

- reuse validated runner-owned Vagrant linked-clone masters\n- create the default guests in bounded two-machine batches\n- capture create timing and runner utilization diagnostics

.ansible-lint

@@ -20,3 +20,8 @@ exclude_paths:
 
 skip_list:
   - var-naming[no-role-prefix]
+
+# The Molecule Vagrant driver injects this module at runtime. The custom create
+# playbook is syntax-checked separately against the exact pinned plugin module.
+mock_modules:
+  - vagrant