docs: update all documentation to reflect deployed state (2026-05-09)

- docs/README.md: add full documentation index (was empty)
- docs/servers/ROCINANTE.md: create new server doc (RTX 4090, heavy inference)
- docs/servers/SERENITY.md: fix CPU spec (dual X5690, not single); add reranker service
- docs/architecture/SERVICES_DIRECTORY.md: fill in all service ports (was all dashes)
- docs/architecture/ARCHITECTURE_OVERVIEW.md: mark all services as deployed
- docs/planning/HOMELAB_EXPANSION_PLAN.md: mark all 6 phases complete

docs/servers/ROCINANTE.md

@@ -0,0 +1,31 @@
+# Rocinante
+
+Heavy AI inference server.
+
+## Hardware
+
+| Component | Details |
+|-----------|---------|
+| **IP** | 10.5.1.112 |
+| **GPU** | NVIDIA RTX 4090 (24 GB VRAM) |
+| **Role** | Heavy AI inference (Ollama) |
+
+## Services
+
+### Ollama
+
+Ollama runs on port `11434` and hosts the large-model ("heavy") tier.
+
+| Model | Use |
+|-------|-----|
+| `qwen3:latest` | Fast reasoning / general chat |
+| `qwen2.5:32b` | Large-context tasks |
+| `gemma3:27b` | Multimodal / vision |
+
+> **LiteLLM tier:** Rocinante is the **"heavy"** tier in LiteLLM `config.yaml`.
+> Heavy-tier requests from OpenWebUI and n8n route to `http://10.5.1.112:11434`.
+
+## Notes
+
+- No SSH config needed for routine use — Ollama API is accessed over LAN only
+- Do not run multiple large VRAM allocations simultaneously on the 4090