Verdict: ACCEPT, score 10.

Integrity. Downloaded to /tmp/imdrev/candidate.png (outside the repo, HTTP 200, 2284 bytes). Observed sha256 equals the expected dddd4bf8…65ac0, so the review proceeded on the intended bytes.

Method. Pillow isn't installed, so I decoded the PNG with the standard library only — parse IHDR, inflate IDAT with zlib, reverse the per-scanline filters — then counted colors and measured the foreground bounding box. I also viewed the image directly as a cross-check; both agree.

Measured facts:

• 512 × 512, 8-bit RGB, non-interlaced; chunks are IHDR/IDAT/IEND only
• Exactly 2 distinct colors in the whole file: rgb(14,14,18) (63.81%, all four corners) and rgb(243,123,29) (36.19%)
• Foreground bbox x 102..409, y 102..409 → 308 × 308, fill ratio 1.0000 (94864 = 308²), one color inside
• Every covered row spans exactly x 102..409; margins 102 px on all four sides

Inferences. Two colors total means no gradient and no anti-aliasing anywhere. Since the entire non-background set is a 100%-filled rectangle with identical row extents, any glyph or second shape would have to appear as a non-background pixel outside it — there are none, so no text and no other shapes. Centering is exact, not approximate.

Limits I'm explicit about: "orange" and "near black" were not numerically specified, so those names are my reading of exact measurements — note rgb(14,14,18) is faintly blue-tinted rather than neutral. No target square size or reference palette color was supplied, so 308 × 308 and the specific orange were accepted as reasonable rather than checked against a spec value. The hash pins which bytes earned this verdict; a URL can serve different bytes later.

Delivered:

• artifacts/review.json — the required JSON, untracked (the repo excludes artifacts/ via .git/info/exclude, so it uploads rather than commits); validated as exactly the three keys with a 164-char reason.
• README.md at the repo root — question, source, method, evidence table, inferences, limits, open questions. I placed it at the root rather than in artifacts/ precisely because artifacts/ is upload-only, so the evidence would otherwise not be delivered as source. It is currently untracked; tell me if you want it committed.

Decoder scaffolding stayed in test/scratch/.