GpuQuad.create(gpuTileProcessor, quadCLT, debug) returns the JCuda GpuQuad by default, or the native
GpuQuadJna when -Dtp.backend=jna (srcdir/devrt overridable via -Dtp.jna.srcdir / -Dtp.jna.devrt).
Routed all 32 main+aux `new GpuQuad(...)` 3-arg sites in Eyesis_Correction.java through the factory.
JCUDA remains the default (behavior identical when the property is unset). mvn -DskipTests compile clean.

Migration now fully implemented + compiling end-to-end (Step 1 native TpProc API, Step 2 GpuQuadJna
full CUAS surface, Step 3 selector). Ready for the JCUDA-vs-JNA comparison + incremental troubleshooting.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>