High-res tile textures: floor, claimed floor, earth, rock, gold, churning water and lava

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

art/generated/textures/PROMPTS.md

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+# High-res tile textures (test)
+
+Generated on 2026-11-07 with fal.ai for the high-res graphics style (`HD_TILES` in `src/gfx.rs`).
+
+- Model: `fal-ai/flux-2-pro`, `image_size: square_hd` (1024x1024), `output_format: png`,
+  `seed: 4242` (floor and gold: a second try with `seed: 4243` and the prompts below; the first
+  floor had a frame and a centre motif, the first gold too few veins)
+- Prompt: the kind's sentence followed by the shared style text.
+- `tools/make_tile.py <name>-raw.png <name> --size 128 --colors 32` scales it to a 2x2 block of
+  64x64 tiles, makes it seamless and reduces the colours; `<name>-128.png` is copied to
+  `assets/textures/<name>.png`. `<name>-128-preview.png`: 3x3 copies to check the seams.
+
+Shared style text:
+
+```text
+Seamless tileable square texture, viewed straight from above (orthographic top-down, no perspective), flat even lighting, no shadows, no vignette, no border, no text. Hand-painted pixel art style for a dark-fantasy dungeon strategy game: chunky clear shapes, crisp edges, limited muted palette, readable at small size. The pattern continues seamlessly across all four edges.
+```
+
+## floor: T_FLOOR (dug-out floor)
+
+```text
+A uniform all-over pattern of rough grey-brown cobblestones of mixed sizes set in packed dirt, evenly spread from edge to edge with no frame, no border and no centre motif, like a cropped piece of a large dungeon floor.
+```
+
+## claimed: T_CLAIM (claimed floor)
+
+```text
+The floor of an evil dungeon master's lair: fitted dark crimson-purple flagstones with thin black grout lines, some stones carry a small faint carved demonic rune, worn and polished.
+```
+
+## earth: T_EARTH (earth blocks)
+
+```text
+Solid packed brown earth seen from above, soil with small stones, roots and darker clumps, slightly lumpy.
+```
+
+## rock: T_ROCK (bedrock)
+
+```text
+Hard dark blue-grey bedrock seen from above, angular rock facets and deep cracks, very solid and impenetrable.
+```
+
+## gold: T_GOLD (gold seam)
+
+```text
+A uniform all-over pattern of brown earth crossed by many thick glittering veins of bright yellow gold ore with large shining gold nuggets, the gold covering about a third of the surface, evenly spread from edge to edge.
+```
+
+## water: T_WATER
+
+```text
+Deep dark blue underground river water seen from above, gentle wave crests and ripples in lighter blue-cyan, slight foam streaks.
+```
+
+## lava: T_LAVA
+
+```text
+Molten lava seen from above, glowing orange and yellow molten rock flowing in swirls, darker red cooling streaks, very hot and bright, no black crust.
+```
+
+## In the game
+
+Water and lava flow as before (the shader moves the texture along the river and lets the surface
+swell); in the high-res style a second, larger layer of the same texture drifts slower and
+sideways over it, so the surface churns.