Add initial project documentation

docs/services/inference-service.md

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+# Inference Service
+
+**Package:** `@nexusai/inference-service`  
+**Location:** `packages/inference-service`  
+**Deployed on:** Main PC  
+**Port:** 3001
+
+## Purpose
+
+Thin adapter layer around the local LLM runtime (Ollama). Receives
+assembled context packages from the orchestration service and returns
+model responses.
+
+## Dependencies
+
+- `express` — HTTP API
+- `ollama` — Ollama client
+- `dotenv` — environment variable loading
+- `@nexusai/shared` — shared utilities
+
+## Environment Variables
+
+| Variable | Required | Default | Description |
+|---|---|---|---|
+| PORT | No | 3001 | Port to listen on |
+| OLLAMA_URL | No | http://localhost:11434 | Ollama instance URL |
+| DEFAULT_MODEL | No | llama3 | Default model to use for inference |
+
+## Endpoints
+
+| Method | Path | Description |
+|---|---|---|
+| GET | /health | Service health check |
+
+> Further endpoints will be documented as the service is built out.