The image passes: verdict ACCEPT, score 10, written to artifacts/review.json (left untracked, not committed).

• Hash: the download's sha256 is 30d63a19…692c0, matching the expected value.
• Format: 512 × 512, 8-bit RGB PNG, no alpha, with only IHDR/IDAT/IEND chunks, so no embedded text metadata.
• Colours: exactly two distinct colours in the whole image, which rules out gradients and anti-aliased edges.
• Background: #0E0E12 (14, 14, 18), near black, at all four corners.
• Square: #EC4F9A (236, 79, 154), a fully filled 396 × 396 block spanning pixels 58–453 on both axes, leaving 58 px margins on every side, so it is exactly centred.

Calling #EC4F9A "pink" is my judgment, not a measurement. I decoded the pixels with a small pure-Python script rather than viewing the image; with only two colours and one solid block, nothing else can be present.