A3 plus two CCD colour-shift construction checks

The added response is a translation proportional to recorded colour minus the training reference colour. Native source roles, normalization and the base A3 family remain unchanged; no held-out performance claim follows from construction.

Full method and records · Model campaign · Inspection hashes

Actual archived C4 source data/model/residual supporting the first19-direction construction test.
Actual archived C4 source data/model/residual supporting the first19-direction construction test.
Actual flux-profiled CCD-shift derivative stamps before and after existing A3 projection.
Actual flux-profiled CCD-shift derivative stamps before and after existing A3 projection.
Conditional19-direction rank check. This alone does not test WCS or the full ePSF shape tangent.
Conditional19-direction rank check. This alone does not test WCS or the full ePSF shape tangent.
Exact new-full strict-fold TRAINING sources and stage1 model behind the61-direction check.
Exact new-full strict-fold TRAINING sources and stage1 model behind the61-direction check.
The same new-full training sources: CCD-shift derivatives before/after17-colour plus42-WCS projection.
The same new-full training sources: CCD-shift derivatives before/after17-colour plus42-WCS projection.
Training-only61-direction rank and retained CCD-shift norm. ePSF base/modes remain fixed.
Training-only61-direction rank and retained CCD-shift norm. ePSF base/modes remain fixed.