@@ -110,7 +110,7 @@
       "dir": "showcase/terrain-scatter",
       "category": "terrain",
       "teaches": "A Geometry Nodes hill tile with an embedded scatter of glacier-worn boulders of varied size through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "alt": "A square meadow hillside tile in dense green grass, nine lichen-blotched granite boulders sunk among taller tufts, a bare-earth footpath with pebbles winding across it, drifts of daisies and pink and purple wildflowers, three round shrubs, one dotted with yellow gorse bloom, and a cut side showing a turf lip, dark humus, ochre clay, a cobble bed and grey bedrock.",
+      "alt": "A square meadow hillside tile: lichen-blotched granite boulders in dense grass and wildflowers, a pebbled footpath, three shrubs, and a cut side showing turf, soil and bedrock layers.",
       "witnessesFix": "Recomputed: 2986 tris, two materials with 654 stone faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.800x1.800x0.609 m, grounded zmin, 9 stones of >=54 faces each sealed into the ground in 8/8 sectors, footprint ratio 9.8, rim tilt step 33.5 deg, no stone pairs overlapping, LOD ratios in band, convex collider 54 tris, hygiene zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --poke-rock 17; --float-rocks 18; --box-rocks 19; --pile-rocks 20; --perch-rocks 21; --uniform-rocks 22; --sharp-rim 23.",
       "hero": "docs/gallery/assets/terrain-scatter-hero.webp",
       "preview": "showcase/terrain-scatter/preview.webp",
@@ -940,7 +940,7 @@
       "dir": "showcase/sea-stack-arch",
       "category": "terrain",
       "teaches": "A procedural coastal diorama tile — a fragment of a bedded sandstone headland at the sea's edge as one eroded mass: eighteen level hard and soft beds running on from the legs into the roof and the stack, jointed faces leaning back and battered and flared at the foot, one weathering field read on the face through every bed, fallen-out blocks and open joints, soft beds undercut to a wave-cut notch; two legs curving in on an ellipse to meet at the crown under a roof that steps down seaward; a tapering stack standing in the sea; the sea filling the tile to its rim with foam at the shore and round the feet, a wave-cut platform whose planed beds outcrop as low steps, tide pools, a sandy cove with a shingle bank and a turf clifftop bank on the landward edge, the tile's skirt showing the beds in section, fallen blocks broken on slanting fracture faces, boulders and pebbles, and a draped turf mat with sea grass and thrift cushions — through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "alt": "Seen from above on a dark stage, a ragged sea arch of buff, rust and grey sandstone beds and a tapering sea stack stand in turquoise-to-deep-blue water ringed with white foam, beside a stepped wave-cut platform, a sandy cove with pebbles and a strip of turf clifftop, with pink thrift on the turfed tops.",
+      "alt": "A sea arch and a tapering sea stack of banded sandstone beds in turquoise water ringed with foam, beside a wave-cut platform, a pebbled cove and turf clifftop, with pink thrift on top.",
       "witnessesFix": "Recomputed: 90422 tris, eight materials with 46448 sandstone, 13438 shelf, 5546 water, 1966 foam, 2856 cobble, 5540 turf, 5331 grass and 3552 thrift faces, UVs in 0..1 with zero AABB overlap, outer AABB 2.840×1.960×1.465 m, zmin 0, hygiene 0 including zero coplanar cross-shell pairs across 43 bed shells, every soft bed's end rings inside the hard beds either side (41 joints, 0.0019–0.0163 m) with the roof's lowest bed biting both legs 0.015 m, the stack's mass centre 0.128 m inside its foot notch's footprint (min 0.100), both legs and the stack sealed in the ground in 8 of 8 sectors (worst 0.031 m, min 0.020), a clear aperture 0.272 m wide and 0.757 m high (min 0.22 × 0.68), all 21 hard bed tops level (0.00°) and continuous across the columns, the 22 soft beds undercut 0.016–0.079 m (band 0.008–0.085), the sea at 0.1050 m with a 0.0024 m ripple and both pools flat, every water rim 0.010 m under the shore or the tile's rim (min 0.008), the foam within 0.0043 m of the waterline with its land edge 0.005 m under the ground or in the rock, all 57 blocks, boulders and pebbles sealed in every sector and none overlapping, all 324 roots of grass and thrift 0.008–0.040 m in the turf or stone and none loose, 0.176 of the rock's walls squared to their column's axes (max 0.25), LOD ratios in band, five-hull collider 252 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --gap-lintel 17; --lean-stack 19; --cut-pillar 20; --close-arch 21; --tilt-beds 22; --flush-beds 23; --flat-sea 24; --short-sea 25; --lift-foam 26; --perch-talus 27; --pile-talus 28; --float-cover 29; --tidy-rock 31.",
       "hero": "docs/gallery/assets/sea-stack-arch-hero.webp",
       "preview": "showcase/sea-stack-arch/preview.webp",
@@ -1096,7 +1096,7 @@
       "dir": "showcase/canyon-mesa-tile",
       "category": "terrain",
       "teaches": "A procedural strategy-game desert map tile of Colorado Plateau character — a square 2.40 m on a side where two mesas, a butte and a slender spire are cut from one horizontal layer cake: scree aprons at the angle of repose up to the cliffs' foot, five sandstone beds each its own colour and weathered into partings, read as level strata, a crumbling shale slope, a flat overhanging caprock of weathered slickrock; the beds at one height on every formation and straight across the canyon between the mesas; a totem spire; a dry wash falling from the back edge to the front, a dune field, angular fallen blocks, low juniper bushes, sage and rabbitbrush, and cottonwoods — through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "alt": "A square desert map tile seen from above: two mesas banded in level red, orange and cream strata under dark caprock with a canyon between them, a banded butte and a slender totem spire on scree aprons strewn with fallen blocks, juniper and sage dotting the red floor, and a pale dry wash lined with gold cottonwoods.",
+      "alt": "A square desert map tile: two mesas and a butte banded in level red and cream strata under dark caprock, a banded spire on scree aprons, and a pale dry wash lined with gold cottonwoods.",
       "witnessesFix": "Recomputed: 127676 tris, eight materials with 51200 ground, 34932 sandstone, 10620 caprock, 4420 wash, 6480 block, 884 bark, 16704 foliage and 1280 plinth faces, UVs in 0..1 with zero AABB overlap, outer AABB 2.400×2.400×0.6221 m, zmin 0, hygiene 0 including zero coplanar cross-shell pairs, all four formations' feet 0.034 m in their aprons, all seven bedding planes at one height on every formation that carries them (spread 0.0000 m) with both canyon walls carrying every plane, the three caprock tops level to 0.0000 m, 7006 talus faces at 30.8–36.2° (repose band 30–37°), the wash never rising from row to row over 316 rows and a 0.0225 m fall, its ends 0.004 and 0.008 m in from the back and front edges and its edges 0.0033 m under the banks, all 60 blocks sealed in every sector (worst 0.0040 m) and none overlapping, all 46 trunks' feet 0.009–0.010 m in the ground and all 118 scrub cushions bedded, LOD ratios in band, five-hull collider 242 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --perch-butte 17; --tilt-beds 18; --dome-cap 19; --steep-talus 20; --uphill-wash 21; --perch-rock 22; --pile-rocks 23; --float-plants 24.",
       "hero": "docs/gallery/assets/canyon-mesa-tile-hero.webp",
       "preview": "showcase/canyon-mesa-tile/preview.webp",
@@ -1124,7 +1124,7 @@
       "dir": "showcase/river-delta-tile",
       "category": "terrain",
       "teaches": "A procedural strategy-game map tile of a river delta — a square 2.40 m on a side, low and flat, where a river comes in through the back edge and forks twice at the angle natural deltas grow toward into four distributaries, each child's width set by hydraulic geometry so the widths squared balance at every fork; its water falling along every channel and level with the sea through the backwater reach to every mouth; natural levees holding each channel over the marsh; a farmed upper plain in a hedged patchwork of staggered fields drilled in rows, a wild lower plain of marsh, salt marsh and mud with an oxbow lake and ponds; a lobed coast with soft tan silt plumes fading into a sea whose colour ramps smoothly with depth out to a slate quay wall, and arrowhead marsh-crowned bars off the mouths; reed beds, weeping willows and poplars, drift logs afloat and stranded up the beaches, and a fisherman's stilt hut with its jetty, boat and a V-shaped wattle fish weir — through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "alt": "A square delta map tile: a river splitting twice into four channels across hedged patchwork fields and marsh, soft tan plumes in a turquoise-to-blue sea, sandy marsh-topped islets off the mouths, a stilt hut by a jetty and a V-shaped fish weir.",
+      "alt": "A square delta map tile: a river splitting into four channels across hedged fields and marsh, tan plumes in a turquoise sea, sandy islets off the mouths, and a stilt hut by a jetty.",
       "witnessesFix": "Recomputed: 140062 tris, seven materials with 52606 ground, 46595 water, 17414 reed, 998 timber, 646 bark, 5420 foliage and 10752 plinth faces, UVs in 0..1 with zero AABB overlap, outer AABB 2.400×2.400×0.295 m, zmin 0, hygiene 0 including zero coplanar cross-shell pairs, the water never rising along any of the four courses (largest step 2e-7 m over 2863 samples, max 1e-6), the children's wetted widths squared over the parent's 0.960, 1.008 and 0.991 at the three forks (band 0.88–1.12) and the forks opening 73.3°, 73.6° and 74.0° (band 58–82), every mouth's course wet all the way and ending at the sea's level, every levee crest at least 0.0078 m over its channel and 0.0021 m over the marsh behind at 228 stations, all six islands' cores 0.0040–0.0050 m out of the water round them, the sea at 0.1500 m with a 0.0024 m ripple and the ponds flat, every water rim at least 0.0025 m under the ground, all 4350 reed blades 0.0037–0.0059 m in the ground, the floating logs and the boat 0.33–0.55 of their height under the water and the stranded logs sealed in every sector, all 28 stilts, jetty posts and stakes footed 0.0099–0.0155 m in the bed with their tops over the water, all 35 trunks 0.009–0.011 m in the ground, LOD ratios in band, eight-hull collider 174 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --uphill-channel 17; --choke-branch 18; --splay-fork 19; --plug-mouth 20; --breach-levee 21; --drown-islet 22; --flat-sea 23; --short-sea 24; --float-reeds 25; --sink-logs 26; --lift-hut 27; --float-trees 28.",
       "hero": "docs/gallery/assets/river-delta-tile-hero.webp",
       "preview": "showcase/river-delta-tile/preview.webp",