Persistent storage for brand identity guidelines used to generate brand-consistent images. Structured YAML with sections: colors (primary, secondary, accent, neutrals), typography (font families, styles), style preferences (minimalist, bold, playful, professional), logo usage (placement, sizing, clear space), and tone (voice, mood, personality). WRITE when user sets up brand guidelines via task:brand.guidelines.setup. UPDATE when user modifies brand guidelines. READ before generating any brand-consistent images to ensure visual consistency. This file enables the brand image generator to maintain consistent visual identity across all generated images, incorporating brand colors, style, and aesthetic preferences into image generation prompts.