**Overall Verdict:** Strong Accept — The submission is complete, technically coherent, safely packaged, objectively graded, and supported by credible end-to-end validation.

**Completeness Check:**
- Instruction: Complete — The required executable, command-line interface, lossless reconstruction contract, byte budgets, runtime environment, time limit, and all-or-nothing success condition are explicit.
- Inputs: Complete — Thirteen development and 11 hidden sweeps have consistent binary little-endian PLY and JSON schemas, valid point counts, integer-millimeter coordinates, reflectance values, metadata, and budgets.
- Toolchain: Complete — TMC13 release-v22.0 source and binaries, CMake 3.28.3, build requirements, Python dependencies, licenses, and an agent-visible development evaluator are supplied.
- Reference output: Complete — The private reference pipeline, encoder patch, hidden sweeps, decoder, oracle results, per-point ground truth, positive fixture, and negative control provide a reproducible answer-key path.
- Rubric: Complete — The evaluator enforces executable and regular-file requirements, isolation, 300-second encoding limits, decoder conformance, exact multiset equality, byte budgets, and all-11-sweep aggregation.

**File and Task Reachability:**
Attachment classification: reachable. Task classification: reachable. All four manifest attachments were inspected: `gpcc_lidar_lossless_archival__input_materials.zip`, `gpcc_lidar_lossless_archival__reference_and_evaluation.zip`, `gpcc_lidar_lossless_archival__reference_ground_truth_arrays.zip`, and `gpcc_lidar_lossless_archival__self_test_evidence.zip`. They are readable, unencrypted ZIP containers of approximately 23.0 MB, 18.4 MB, 20.4 MB, and 3.57 MB, containing 3,528, 229, 25, and 35 regular-file entries respectively. Integrity tests passed, declared byte counts matched, and no traversal paths, links, device entries, or material expansion risks were found.

Representative documentation, manifests, evaluator and scoring source, development and hidden PLY/JSON records, provenance and license notices, oracle records, NPZ headers and contents, reference-build documentation, validation reports, grading logs, and transcript samples were inspected without executing submitted code. All 24 sweep records agree with their manifests; the 24 NPZ files contain consistent `xyz`, `refl`, `row`, `col`, and `ret` arrays and match corresponding PLY coordinates and reflectance point by point. Every budget equals `ceil(1.05 × S_ref)`, and each oracle’s `S_ref` is its smallest recorded candidate. The solver-visible and evaluator-private materials are properly separated. The independent decoder copy is byte-identical to the solver-visible TMC13 binary and matches the authoritative inner checksum. Submitted reports show the input-only reference pipeline passing 11/11 within budget and time, while the lossless octree negative control passes 0/11 because every result exceeds its budget.

The end-to-end path is clear: inspect development sweeps, build and package the archival encoder, invoke it in an isolated per-sweep directory, decode its G-PCC output with the verified stock decoder, compare canonical point multisets, enforce the byte budget, and award 1 only when all 11 hidden sweeps pass. Large source trees, executable bodies, VBA payloads in two nonessential upstream result spreadsheets, and complete transcript bodies were not executed or exhaustively line-reviewed; their types, structures, and representative content were safely inspected. Public-source provenance claims could not be independently searched, but the submission provides specific commits, hashes, notices, and coherent licensing evidence. 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 submission already provides unusually thorough provenance, isolation, reference, robustness, and control evidence. No changes are required.