# Cleanroom and independent review report

## Outcome

The exact prompt was executed once in an empty workspace by an isolated Codex agent using Burr skill commit `3a1b8ebf17e178b28c6d65f67ad04fc97f009a55`, CAD skill commit `fc4f7069fb31c131a55f1ecd334b505f031f486b`, and KiStack commit `c5a25d1d0af7ae811666cab41d7952f41e310575`.

Prompt SHA-256: `394d94afe5622c2cc86f75955a4a430ee1d9883ff4be4308cc8aa4a50aa25dcd`.

No sibling experiment was visible and no parent-agent steering occurred after execution began. No purchase, fabrication, hardware power-up, publication, or external contact occurred during the run.

## Reproduced digital evidence

- Mechanical CAD: 9/9 final STEP targets passed topology, closure, and positive-volume validation.
- Product face: 216 × 138 mm.
- Nominal enclosure depth excluding stand: 29 mm.
- Burr motion: 61 rigid frames, eight instances, 1200 ms.
- KiCad ERC: exit 0, zero violations.
- KiCad DRC/parity: exit 5. The saved run recorded 742 DRC violations, zero unconnected items, and 295 schematic-parity issues.

The independent review reran ERC and reproduced exit 0. Three exact DRC reruns—including the cleanroom receipt—reproduced exit 5 and 295 parity issues; the DRC count varied between 740, 742, and 784 after zone refill. The stable conclusion is failure, not an exact deterministic violation count.

## Integration boundary

Because DRC/parity failed, the run correctly withheld populated PCB STEP, PCB renders, Gerbers, and drill files. The assembly retains an explicitly named `unverified_populated_component_envelope_4p5mm` rather than presenting a fabricated board model as authoritative.

Burr's integrated checks are also not passes:

- Deployed: `fail`, six findings across 28 checked pairs.
- Folded: `fail`, seven findings across 28 checked pairs.
- Exploded: `fail`, three findings across 28 checked pairs.
- All three carry an `open_component_mesh` incomplete reason.

## Trust boundary

Trusted: the exact prompt and provenance, editable CAD and KiCad sources, ERC-clean schematic, generated BOM/PDF, nine valid CAD outputs, relative Burr project, named fold motion, and preserved failed evidence.

Not trusted: PCB routing or fabrication readiness, populated-board integration, connector reach, power integrity, antenna performance, thermal or electrical safety, enclosure fit, stand strength, durability, or production readiness.