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/tasks/driver.yml

@@ -0,0 +1,25 @@
+---
+# ------------------------------------------------------------------------------
+# FILE: roles/llm-inference/tasks/driver.yml
+# DESCRIPTION: Phase 2 — NVIDIA driver.
+#              Installs nvidia-driver-595-open via apt. Fully idempotent —
+#              already installed on astro-orbiter on 2026-08-03, this is a no-op.
+#              DKMS builds the kernel module automatically on install.
+# ------------------------------------------------------------------------------
+
+- name: Install NVIDIA driver package
+  ansible.builtin.apt:
+    name: "{{ llm_nvidia_driver_package }}"
+    state: present
+    update_cache: false
+  notify: reload systemd
+
+- name: Verify nvidia-smi reports the GPU
+  ansible.builtin.command: nvidia-smi --query-gpu=name,memory.total,driver_version --format=csv,noheader
+  register: nvidia_smi_out
+  changed_when: false
+  failed_when: nvidia_smi_out.rc != 0
+
+- name: Print nvidia-smi output
+  ansible.builtin.debug:
+    msg: "GPU detected: {{ nvidia_smi_out.stdout }}"