**Overall Verdict:** Strong Accept — The submission is complete, internally consistent, objectively gradable, and fully reachable with the declared open-source toolchain.

**Completeness Check:**
- Instruction: Complete — Transform conventions, geometry formulas, distortion model, null behavior, ordering, tolerances, and exact output schema are explicit.
- Inputs: Complete — `scene.json` is valid JSON with camera parameters, static calibration, needle geometry, and three well-formed rigid-pose frames.
- Toolchain: Complete — Python 3.11 and NumPy 1.24+ on Linux are freely obtainable; no network, specialized hardware, or proprietary software is required.
- Reference output: Complete — `result.json` covers all frames and edge cases, including a parallel ray and a behind-camera tip; independent recomputation matched it to floating-point precision.
- Rubric: Complete — `grader.py` enforces exact structure, frame order, null agreement, finite numeric values, unit vectors, and the stated component and pixel tolerances.

**File and Task Reachability:**
The attachment set is `reachable`, and the end-to-end task is `reachable`. `SPEC.md`, `scene.json`, `result.json`, and `grader.py` were all inspected in full; their actual formats and byte counts match the manifest, and no content remained unreviewed. The review environment lacked the declared Python runtime, so the uploaded grader was statically inspected rather than executed; reference calculations were independently reproduced with a separate local runtime. A solver can read the specification and scene, implement the NumPy geometry, produce the required JSON array, and have it evaluated deterministically against the 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 submission provides coherent inputs, meaningful geometric edge cases, a verified reference, and a hardened evaluator. No changes are required.