Replaces the would-be per-kernel checkbox sprawl (Andrey 07/12 design):
- CuasRtParameters: KERNEL_TESTS registry {none, avg_td} + kernel_test
  String param (addChoice, corr-xml _curt_kernel_test, unknown values
  sanitized to none); one dropdown entry per kernel in the 2c+ ladder.
- CuasRT.diagnostics(): kernel_test != none -> EXCLUSIVE kernelTest()
  dispatch, nothing else runs that pass.
- kernelTest() avg_td case = the AvgTdExport call site (settles the open
  pick): conditioned image_data of the GPU-bound scene -> uniform-grid
  convert -> CPU oracle + testdata case export (<model>/testdata/avg_td,
  incl. per-sensor TpTask XY for the OOB soft/hard-margin stage) ->
  validateConsolidation; imports+compares C++ results/ when present,
  else prints the exact tests_bin command to run.
- CuasMotion.convertFromData: overload with tasks_out (old signature
  delegates) so the export gets the conversion TpTask grid.

mvn -DskipTests clean package: OK. Run validation in Eclipse = Andrey's.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>