docs: icon-attractor section + 12 viral scroll-video prompts (leans on ERNIE's text-in-image strength)

docs: add prompting guide + simple-vs-ideal prompt table (Mistral3 encoder; quote-text for in-image rendering)

docs: declare SFW-by-default safety policy + reference safety_negative_prompt.txt

docs: VAE is ERNIE's own 32-ch AutoencoderKLFlux2, not Flux's 16-ch ae

engine renamed: KilnImage → Mirage

KilnImage 0.1.0: initial ERNIE-Image-Turbo iOS bundle