**Overall Verdict:** Accept — The submission is complete, objectively scorable, and end-to-end reachable, with only nonmaterial documentation inconsistencies.

**Completeness Check:**
- Instruction: Complete — clearly specifies the 10×10×10 reconstruction, exact block-state requirements, orientation constraints, output format, and exclusions.
- Inputs: Complete — the 393.459-second, 1240×720 H.264 tutorial is readable and representative frames confirm the material list, orientation, construction process, interior details, and final exterior views. It contains an AAC track despite being described as having no audio, but this does not affect the visual task.
- Toolchain: Complete — Python, FFmpeg, and nbtlib are legally obtainable, cross-platform tools supporting the complete workflow.
- Reference output: Complete — `answer.schem` is a valid gzip-compressed Sponge v3-shaped 10×10×10 NBT schematic containing 1,000 positions, 23 palette states, and 482 non-air blocks. The evaluator is coherent with the output contract.
- Rubric: Complete — exact block-state IoU, translation handling, ignored data, failure behavior, and the passing threshold are explicitly defined.

**File and Task Reachability:**
Attachment classification: `reachable`. Task classification: `reachable`. I inspected `tutorial.mp4`, `instruction.md`, `score_schematics.py`, `answer.schem`, `readme.md`, `codex-gpt5.6sol-xhigh.zip`, and `codex-gpt5.6sol-high.zip`. Both ZIP directories were inventoried and showed no encryption, unsafe paths, symbolic links, device entries, or excessive expansion; score reports, trajectory summaries, valid JSONL trajectories, candidate schematics, reconstruction scripts, and five contact sheets were inspected without executing submitted code. Large duplicate MP4/MOV members, remaining frame images, and macOS metadata were inventoried but not decoded because they are redundant and noncritical. The review environment lacked Python and FFmpeg, so the submitted evaluator was not executed and media was not directly decoded; independent structural parsing reproduced both reported IoU scores and validated the schematics. The xhigh score report reverses candidate and ground-truth labels, but its symmetric IoU result remains correct. Solver inputs and reviewer-only reference/self-test materials are separated by manifest role; the self-test archives contain ground-truth copies and must remain reviewer-only. An ordinary user can inspect the tutorial, generate `output.schem` with the declared open-source toolchain, and receive deterministic evaluation against the withheld reference. License keys, accounts, tokens, and other credentials are not required from the contributor. Confidential, proprietary, or internal material may be evaluated as submitted evidence without requiring additional disclosure.

**Special Screening:**
None

**Recommended Changes:**
The core task, evidence, and evaluation path are valid. No material changes are required.