Add meigen-ai-design plugin

plugins/meigen-ai-design/commands/gen.md

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+---
+name: gen
+description: >-
+  Quick image generation. Use when user runs /meigen:gen with a prompt.
+  Skips intent assessment, generates directly.
+argument-hint: <prompt>
+---
+
+# Quick Generate
+
+Generate an image immediately from the user's description. This is the fast path — skip exploration and go straight to generation.
+
+## Instructions
+
+1. Look at the user's prompt: `$ARGUMENTS`
+2. If the prompt is very short (under 10 words), call `enhance_prompt` first to enrich it, then use the enhanced result
+3. If the prompt is already detailed (10+ words), use it directly
+4. Delegate to the **image-generator** agent with the prompt (keeps base64 data out of main context)
+5. When the agent returns, show a brief one-line creative comment about the generation
+
+Do NOT:
+- Ask for confirmation before generating
+- Suggest alternatives or options
+- Run search_gallery for references
+- Give lengthy explanations or describe the image
+- Call generate_image directly — always delegate to image-generator agent
+
+This is a quick-fire command. Generate and show.