polymorphic images added to Adventure (has_many :images, ALLOWED_IMAGEABLE_TYPES expanded, routes concern :imageable, back_path fix for nested resource). hero variant (800×450) added to Image model. Images manager on adventure edit page (upload + per-image caption/sort/remove). Index rewritten as responsive tile grid (1/2/3/4 cols). Gradient placeholder for adventures without cover art. get_adventure MCP tool returns images array. BL-091 added for AI generation (needs ADR).
BL-090
Shipped