docs: create mcp-image-gen wiki page

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+# 🎨 mcp-image-gen — AI Image Generation
+
+![Image Gen Banner](http://192.168.188.119:30008/pplate/pi_mcps/raw/branch/main/docs/wiki/images/image-gen-banner.png)
+
+**mcp-image-gen** is a FastMCP server that wraps the ComfyUI REST API, enabling Roo Code and Claude Desktop to generate images directly from text prompts using FLUX.1-schnell running on an AMD RX 7900 XTX GPU.
+
+## Architecture
+
+```
+Roo Code / Claude Desktop
+  │ MCP (stdio)
+  ▼
+mcp-image-gen (FastMCP, Python 3.11+)
+  │ HTTP REST
+  ▼
+ComfyUI @ localhost:8188
+  │ ROCm / HSA_OVERRIDE_GFX_VERSION=11.0.0
+  ▼
+FLUX.1-schnell (~8s/image @ 1024×1024)
+```
+
+## Tools
+
+| Tool | Description |
+|---|---|
+| `generate_image` | Generate PNG from text prompt; returns file path + inline base64 |
+| `list_available_models` | List ComfyUI checkpoint models |
+| `get_generation_status` | Check status of a queued/running job |
+| `get_output_directory` | Return configured output directory path |
+
+## Key Parameters — `generate_image`
+
+| Parameter | Default | Description |
+|---|---|---|
+| `prompt` | required | Text description of the image |
+| `width` | `1024` | Image width in pixels |
+| `height` | `1024` | Image height in pixels |
+| `steps` | `4` | Inference steps (FLUX.1-schnell is 4-step) |
+| `model` | `flux1-schnell.safetensors` | Model checkpoint name |
+| `seed` | `-1` (random) | Generation seed for reproducibility |
+| `negative_prompt` | `""` | Things to avoid in the image |
+| `output_dir` | `~/Pictures/mcp-generated` | Where to save output PNG |
+
+## Environment Variables
+
+| Variable | Default | Description |
+|---|---|---|
+| `COMFYUI_URL` | `http://localhost:8188` | ComfyUI API endpoint |
+| `IMAGE_OUTPUT_DIR` | `~/Pictures/mcp-generated` | Default output directory |
+| `COMFYUI_TIMEOUT` | `120` | Request timeout in seconds |
+
+## Return Value
+
+The tool returns **two content items**:
+1. `TextContent` — file path, seed used, elapsed time
+2. `ImageContent` — base64-encoded PNG (displays inline in Roo Code chat)
+
+> ⚠️ **Known FastMCP Bug:** Never use `fastmcp.utilities.types.Image` as return type — it breaks serialization in FastMCP 3.x. Use `mcp.types.ImageContent` directly.
+
+## Quick Start
+
+```bash
+cd mcp/mcp-image-gen
+uv sync
+./run.sh
+```
+
+## Run Tests
+
+```bash
+cd mcp/mcp-image-gen
+uv run pytest tests/ -v
+```
+
+## Lumen Profile Images
+
+The first images generated with this server were Lumen's visual identity portraits:
+
+![Lumen Profile](http://192.168.188.119:30008/pplate/pi_mcps/raw/branch/main/docs/wiki/images/lumen-profile.png)
+
+*Primary profile: seed `568659042` — constellation face interpretation of Lumen.*
+
+## ComfyUI Setup
+
+See [mcp-image-gen-ComfyUI-Setup](mcp-image-gen-ComfyUI-Setup) for full installation instructions including AMD ROCm setup.