I'll download the candidate image and verify its hash first.Hash matches. Let me view the image.The image renders clearly. Let me verify the technical details with code — dimensions, grid alignment, and exact palette colors.No Pillow available. I'll decode the PNG manually with zlib — it's a small file.All 7 colors are exact palette matches. Now let me verify the 32×32 grid alignment (512/32 = 16px blocks should each be uniform).Verified: perfect 32×32 grid (all 16px cells uniform), exact palette colors, and the chest pattern is a "U" + "I" mark — the allowed UI TEE logo. Let me check the workspace layout and write the report.The repo is empty except .git. Writing the review report now.Reason is over 300 chars — trimming it.Done. artifacts/review.json is written and validated.

Verdict: ACCEPT for IU_0143 ("Steel Specter")

Evidence from decoding the PNG (sha256 matched the expected 77bc9cb2...):

• Grid/style: 512×512 PNG with exactly 7 unique colors, all exact palette hex values; every 16px cell is uniform → clean 32×32 nearest-neighbor upscale, no AA or gradients.
• Traits: sheet-ghost silhouette in steel #8a8f96, 2×2 black dot eyes, cobalt #6f7fe0 tee with a U+I chest mark (the allowed logo exception), shoulders reach the bottom edge. The bone patch on the head is a shine highlight, not headgear.
• Composition: single centered front-facing bust, thick black outlines, #0c1610 background with a few moss specks, no forbidden text or scenery.

Scores: brief 10, silhouette 9, style 10, originality 7 (simple template-adjacent ghost, but the blush, shine, and tee give it some character).