Battlefield Terrain Art: Grass, Buildings, Water, Forest, and Rock Tiles

Documentation gap found 2026-09-15 via an external devlog audit: this entire terrain-art pipeline shipped and has been live in src/presentation/battlefield-renderer.js since 2026-09-14, but was never promoted out of progress/'s wip-labeled screenshot sequence (092-125) into a numbered milestone here, despite being real, current, shipped rendering — not exploration. Backfilled now; see assets/sprites/README.md for the full blow-by-blow history of every attempt below.

• Grass: the battlefield ground switched from a procedural vector texture to 12 seamless grass-tile images, deterministically varied per grid cell.
• Buildings/Structures: the farmhouse and windmill landmarks switched from vector to real tile art.
• Water: five full attempts before landing on the current approach. In order: a 4-bit autotile system, a 32-shape static-pond set, two rounds of explicitly-dimensioned pond sets (v1 irregular shapes, v2 higher-resolution irregular shapes) chasing reported blurriness, a v3 simpler all-rectangle set, a full revert to pure vector rendering when every image-based version still read as blurry, and finally the shipped fix: pond-tiles-v4, 6 seamless self-bordered 512x512-native textures genuinely high-resolution relative to an in-game tile (the actual root cause of every earlier version's blur was never having enough native resolution to downscale from). Pond generation itself was also reworked alongside this: fully random 0-6 tile count (no forced minimum), organic irregular shape via random-walk growth, each texture variant used at most once per pond.
• Forest: six attempts. Vector, a 39-shape dimensioned multi-tile forest set, a revert to vector, a forest-tiles sheet, then the shipped forest-tiles-v2 (8 seamless self-bordered textures fixing the prior sheet's crop issues directly).
• Rock: a parallel saga to forest -- vector, a 37-formation dimensioned multi-tile set (later a 51-shape revision), a revert to vector, then the shipped rock-tiles-v2 (12 seamless self-bordered textures), completing the image-based trio with water and forest. relabeling; shows the completed trio -- water, forest, and rock all on real tile art together).