llm-inference-multimodel: fix Phase 2 unexpectedly restarting both services

Phase 2 (systemd tag) notified per-service restart handlers and then
called meta: flush_handlers itself, so any run where either unit's
template content changed (including first apply) restarted BOTH
live services immediately in Phase 2 -- before Phase 3 firewall
scoping or Phase 4 smoke tests ran. This contradicted the phase's
documented purpose (units land on disk only, nothing starts/restarts
until Phase 4).

Fix: Phase 2 only reloads the systemd daemon and registers each
template task's changed result. Phase 4 (verify.yml) now decides
start vs restart per-service based on that recorded change, so
restarts remain independent per instance and never fire before
Phase 4.

ansible/roles/llm-inference-multimodel/tasks/verify.yml

@@ -10,18 +10,18 @@
 #              systemd services" intent for durability, not just this-session.
 # ------------------------------------------------------------------------------
 
-- name: Enable and start llama-server-aux
+- name: Enable llama-server-aux and start/restart based on Phase 2 unit-content change
   ansible.builtin.systemd:
     name: "{{ llm_aux_service_name }}"
-    state: started
+    state: "{{ 'restarted' if (llm_aux_unit_deployed.changed | default(false)) else 'started' }}"
     enabled: true
     daemon_reload: true
   become: true
 
-- name: Enable and start llama-server-toolcall
+- name: Enable llama-server-toolcall and start/restart based on Phase 2 unit-content change
   ansible.builtin.systemd:
     name: "{{ llm_toolcall_service_name }}"
-    state: started
+    state: "{{ 'restarted' if (llm_toolcall_unit_deployed.changed | default(false)) else 'started' }}"
     enabled: true
     daemon_reload: true
   become: true