# Aero heat-exchanger synthetic companion suite

Completed: `2026-09-16T03:55:46.034252Z`

This release closes the executable synthetic capability companions while preserving the publication gates. It is not a claim that B02–B05 or D01 are publication-validated.

| Companion | Status | Evidence |
|---|---|---|
| HX-S02-COUPLED-SURROGATE-01 | COMPLETE_WITH_SYNTHETIC_COUPLING_CONTRACT | `HX-S02-COUPLED-SURROGATE-01/REPORT.md` |
| HX-S03-FIDELITY-01 | COMPLETE_SYNTHETIC_FIDELITY_DECISION | `HX-S03-FIDELITY-01/REPORT.md` |
| HX-S04-SENSITIVITY-01 | COMPLETE_SYNTHETIC_SENSITIVITY_SWEEP | `HX-S04-SENSITIVITY-01/REPORT.md` |
| HX-S05-ARCH-01 | COMPLETE_SYNTHETIC_ARCHITECTURE_MATERIAL_TRADE | `HX-S05-ARCH-01/REPORT.md` |
| HX-D01-TRANSFER-01 | COMPLETE_SYNTHETIC_DESIGN_TRANSFER_WITH_FIDELITY_ESCALATION | `HX-D01-TRANSFER-01/REPORT.md` |

## Scientific boundary

Every numeric input in this suite is synthetic and marked as such. Real references supply only methodology families and terminology. Existing generic transfer/CalculiX evidence is cited where appropriate; no generic run is relabeled as PCHE-specific truth.

Machine-readable summary SHA-256: `00CC07306ABEAD4686468ADA1E5A0570067CE0A193E5C43CBF5D73C5651C00F6`

The program remains validation-incomplete: pointwise experimental truth, source-specific PCHE CFD/FEA and trusted external timestamps are still open.