小橙子 59b7b124fa
feat(image-gen): add orchestration agent and prompt-craft skill (#64)
The image-gen plugin previously shipped only the MCP server, leaving the
model with no behavioral guidance for when/how to call the tools. As a
result the agent often described what it would generate instead of
calling generate_image, and didn't know that returned image_url blocks
render inline automatically.

Add a plugin-scoped agent and skill following the spark2-gamedev
pattern (auto-discovered via agents/ and skills/ directories):

- agents/image-gen-agent.md: trigger rules, tool selection, prompt
  enhancement workflow, size inference, response patterns
- skills/prompt-craft/SKILL.md: 4 prompt templates (photorealistic,
  artistic, design, concept art), enhancement strategies per subject
  type (people/scenes/objects), zh→en translation guidance

The agent declares requiredMcpServers: [image-gen] so it only surfaces
when the MCP server is actually running.

Co-authored-by: 你的姓名 <you@example.com>
2026-06-17 00:24:27 +08:00
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