TpJna: add tp_convert_direct_selftest binding. Stage2: invoke it against the
tile_processor_gpu/clt golden, report num_active_tiles + max|CLT-golden|.
PASS on 5060 Ti: 5120 active tiles, relative error ~8.85e-6 vs golden (first
real kernel execution + CDP via the native shim, no JCuda).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>