Add standalone export for Two Rivers at Moonrise

assets/games/two-rivers/prompts/backgrounds.md

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+# Environment Production Prompts
+
+Shared constraints: `illustration-story`, 1536×1024 wide side-view game environment, painterly storybook fantasy, adult eye-level camera, clear walk lane across the lower third, layered foreground foliage or architecture, no people in the player lane, no text, watermark, photorealism, anime, or modern objects. Apply `art-direction.md`.
+
+## Palace Courtyard
+
+Warm afternoon Bengali river-palace courtyard prepared for a public manuscript exhibition; carved red stone arches, muslin canopies, indigo textiles, river visible beyond, framed folio displays at right, flowering planters, cinematic sunlight from upper left.
+
+## Royal Library
+
+Quiet Bengali royal archive with terracotta details, tall dark wood shelves, conservation tables, an empty glass folio case, brass lantern mechanisms, rain balcony, warm window light and deep scholarly shadows.
+
+## Moon Garden
+
+Lush palace moon garden at blue-gold dusk; jasmine, tuberose, marigolds, bakul, water channel, old floral mosaic, modest archery range, fireflies, pale moon emerging through foliage.
+
+## Old Marketplace
+
+Busy old Bengali river-city market at early evening; bookstall, flower sellers, communal kitchen, fabric awnings, terracotta façades, lanterns, clear walk lane, inviting civic energy without generated signs.
+
+## Riverside Pavilion
+
+Festival pavilion beside two moonlit rivers; indigo and ivory canopies, flower garlands, safe facsimile display, dance floor, public seating, lantern reflections, celebratory but intimate night atmosphere.