update: add social-media-kit skill

[mvanhorn]

Summary

Adds a social-media-kit skill that generates branded image packs for social media using MiniMax Image API.

What it does

• Takes a brand brief (name, visual style, content theme)
• Generates images at platform-specific aspect ratios: Instagram Post (1:1), Story (9:16), X/Twitter (16:9), YouTube Thumbnail (16:9), LinkedIn (16:9)
• Platform-aware prompt engineering - different compositions for square vs wide vs tall formats
• Batch generation via social_kit.py orchestrator

Why

The MiniMax Image API supports all the aspect ratios social platforms need (1:1, 16:9, 9:16). The existing minimax_image.py script handles API calls. This skill wraps it in a platform-aware workflow with composition guidance per format. YouTube thumbnails get bold/high-contrast prompts, Instagram Stories get vertical mobile-first prompts, etc.

Structure

skills/social-media-kit/
  SKILL.md                          # Skill definition with 6-step workflow
  scripts/
    social_kit.py                   # Batch orchestrator with platform presets
    minimax_image.py                # Image script (copied from frontend-dev)
  references/
    requirements.txt                # Python deps
    platform-specs.md               # Dimensions and composition tips per platform

Test plan

• Verify SKILL.md frontmatter parses correctly
• Run python3 -m py_compile scripts/social_kit.py (passes)
• Test with MINIMAX_API_KEY: generate images for each platform

This contribution was developed with AI assistance (Claude Code).