Add Valentina as 13th AI influencer (24yo blonde, LA beach vibe)

Ship 12 AI influencers, products, style refs, and UGC examples

Fix audit findings: file size metrics, video gitignore, dated examples

Add UGC product selfie workflow, video pipeline, and onboarding fixes

Add character sheet workflow for generating AI influencers from text descriptions

Make repo plug-and-play for new users

Add post-generation image QA, auto-regenerate with retry cap, and Nano Banana 2/Pro defaults

Initial commit: Arcads external API skill, prompts, and agent context