feat: add minimax-image-generation skill for MiniMax image generation

Wraps the MiniMax /v1/image_generation API (model: image-01) as a Claude
Code skill. Pure bash implementation using curl + jq + base64.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

minimax-image-generation/CLAUDE.md

@@ -0,0 +1,64 @@
+# MiniMax Image Generation — Implementation Notes
+
+## API Reference
+
+- **Endpoint**: `POST /v1/image_generation`
+- **Base URL**: `https://api.minimax.io` (international) or `https://api.minimaxi.com` (China)
+- **Auth**: `Authorization: Bearer <MINIMAX_API_KEY>`
+- **Model**: `image-01`
+- **Response**: JSON with `data.image_base64[]` array
+
+## Example API Call
+
+```bash
+curl -X POST "https://api.minimax.io/v1/image_generation" \
+  -H "Authorization: Bearer ${MINIMAX_API_KEY}" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "model": "image-01",
+    "prompt": "men Dressing in white t shirt, full-body stand front view image :25, outdoor",
+    "aspect_ratio": "16:9",
+    "num_images": 1,
+    "response_format": "base64"
+  }'
+```
+
+## Response Format
+
+```json
+{
+  "data": {
+    "image_base64": ["<base64-encoded-jpeg>"]
+  },
+  "model": "image-01",
+  "request_id": "<id>"
+}
+```
+
+## Aspect Ratios
+
+| Ratio | Dimensions | Use Case |
+|-------|-----------|----------|
+| `16:9` | 1920×1080 | Desktop wallpaper, banners |
+| `1:1` | 1024×1024 | Social media, profile images |
+| `9:16` | 1080×1920 | Mobile wallpaper, stories |
+| `4:3` | 1024×768 | Presentations |
+| `3:4` | 768×1024 | Posters, portraits |
+
+## Dependencies
+
+- `curl` — HTTP requests
+- `jq` — JSON parsing
+- `base64` — Decode image data (coreutils)
+
+All three are standard Unix tools. No Python or Node required.
+
+## File Structure
+
+```
+minimax-image-generation/
+├── SKILL.md          # Skill definition + user-facing docs
+├── scripts/
+│   └── generate.sh   # Generation script (CLI entry point)
+└── CLAUDE.md         # These implementation notes
+```