HD-S03 gravel / small stones BC 1024² — ~1 m × 1 m (Round 15 REDO)
Path-edge gravel. Pebbles ~2–8 cm. No flowers. No mirror seams. Toroidal stamps.
metrics={"edge_LR_mean_abs": 1.289, "edge_TB_mean_abs": 1.911, "interior_adj_mean_abs": 1.25, "tile2x2_vseam": 1.289, "tile2x2_hseam": 1.911, "std": 21.906, "mirror_hflip_mae": 23.439, "mirror_vflip_mae": 22.911, "mirror_hflip_mae_over_std": 1.07, "mirror_vflip_mae_over_std": 1.046, "pass_not_mirror": true, "size": [1024, 1024], "pass_seam": true, "pass": true}
N/R/AO not in this drop (§16.9).