HD-T01 / T02 (Round 15 REDO — toroidal procedural, NO mirror)
HD-T01 grass soil BC 2048² — 2 m × 2 m · Singapore cow grass (地毯草)
  short turf + bare soil patches + dry yellow flecks + tiny clover flecks.
  No giant leaves. No baked directional shadows. No mirror seams.
HD-T02 grass far BC 1024² — 8 m × 8 m · independently authored (NOT downscale of T01).
Self-check 3×3: HD-T01_3x3preview.png / HD-T02_3x3preview.png
metrics_T01={"edge_LR_mean_abs": 0.221, "edge_TB_mean_abs": 0.198, "interior_adj_mean_abs": 0.249, "tile2x2_vseam": 0.221, "tile2x2_hseam": 0.198, "std": 11.412, "mirror_hflip_mae": 12.718, "mirror_vflip_mae": 12.788, "mirror_hflip_mae_over_std": 1.114, "mirror_vflip_mae_over_std": 1.121, "pass_not_mirror": true, "size": [2048, 2048], "pass_seam": true, "pass": true}
metrics_T02={"edge_LR_mean_abs": 0.074, "edge_TB_mean_abs": 0.107, "interior_adj_mean_abs": 0.072, "tile2x2_vseam": 0.074, "tile2x2_hseam": 0.107, "std": 6.59, "mirror_hflip_mae": 6.752, "mirror_vflip_mae": 6.569, "mirror_hflip_mae_over_std": 1.025, "mirror_vflip_mae_over_std": 0.997, "pass_not_mirror": true, "size": [1024, 1024], "pass_seam": true, "pass": true, "avg_luma_t01": 85.08, "avg_luma_t02": 91.19, "luma_delta": 6.11}
N/R/AO not delivered; §16.9 allows code to derive from BC.