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/main.yml

@@ -0,0 +1,24 @@
+---
+# ------------------------------------------------------------------------------
+# FILE: roles/llm-inference/tasks/main.yml
+# DESCRIPTION: Entry point — imports one task file per phase.
+#              Phases are additive; re-running the full playbook is always safe.
+# ------------------------------------------------------------------------------
+
+# Phase 1 — Foundation
+- import_tasks: foundation.yml
+
+# Phase 2 — Driver
+- import_tasks: driver.yml
+
+# Phase 3 — vLLM
+- import_tasks: vllm.yml
+
+# Phase 4 — Model
+- import_tasks: model.yml
+
+# Phase 5 — Serve
+- import_tasks: serve.yml
+
+# Phase 6 — Integration
+- import_tasks: integration.yml