Refactoring + final touches

ansible/roles/p2p_network/handlers/main.yml

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+---

ansible/roles/p2p_network/tasks/main.yml

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+---
+- name: Validate p2p NICs exist on this node
+  ansible.builtin.assert:
+    that:
+      - priv_nic_1 in ansible_facts['interfaces']
+      - priv_nic_2 in ansible_facts['interfaces']
+    fail_msg: >-
+      One or both p2p NICs not found on {{ inventory_hostname }}.
+      Expected: {{ priv_nic_1 }}, {{ priv_nic_2 }}.
+      Available interfaces: {{ ansible_facts['interfaces'] | join(', ') }}
+
+- name: Configure p2p bridge in /etc/network/interfaces
+  ansible.builtin.blockinfile:
+    path: /etc/network/interfaces
+    marker: "# {mark} ANSIBLE MANAGED BLOCK - p2p bridge"
+    block: |
+      auto p2p
+      iface p2p inet static
+          address {{ priv_ip }}/{{ ha_vip_cidr }}
+          bridge-ports {{ priv_nic_1 }} {{ priv_nic_2 }}
+          bridge-stp on
+          bridge-fd 0
+  register: p2p_network_p2p_bridge_config
+
+- name: Apply network config  # noqa: no-handler
+  ansible.builtin.command: ifreload -a
+  changed_when: true
+  when: p2p_network_p2p_bridge_config is changed