feat(llm-inference): Day 1 playbook for RTX 3090 vLLM stack on astro-orbiter

- nvidia-driver-595-open (already installed 2026-08-03, idempotent)
- Python venv + vLLM 0.26.0 (already installed, idempotent)
- Gemma 2 27B model download via HuggingFace hub
- systemd vllm-serve.service on port 8000
- Hermes provider integration on carousel-of-progress
- vault_hf_token added to group_vars/all/vault
- ansible.cfg: vault_password_file set to absolute path
- inventory: astro_orbiter group added

Run with: env -u ANSIBLE_VAULT_PASSWORD_FILE ansible-playbook -i inventory.yml playbooks/day1_deploy_llm_inference.yml

ansible/roles/llm-inference/handlers/main.yml

@@ -0,0 +1,29 @@
+---
+# ------------------------------------------------------------------------------
+# FILE: roles/llm-inference/handlers/main.yml
+# ------------------------------------------------------------------------------
+
+- name: Reload systemd
+  ansible.builtin.systemd:
+    daemon_reload: true
+  listen: "reload systemd"
+
+- name: Restart vllm-serve
+  ansible.builtin.systemd:
+    name: vllm-serve
+    state: restarted
+  listen: "restart vllm-serve"
+
+- name: Restart Hermes on carousel
+  ansible.builtin.systemd:
+    name: "{{ item }}"
+    state: restarted
+    scope: user
+  loop:
+    - hermes-gateway
+    - hermes-dashboard
+  become: true
+  become_user: wed
+  delegate_to: carousel-of-progress
+  listen: "restart hermes"
+  ignore_errors: true