ChronosPipeline (legacy T5) does not support amazon/chronos-2 or
chronos-bolt-* (input_patch_size). Switch to BaseChronosPipeline
which auto-detects variant and returns the appropriate sub-pipeline
(ChronosBoltPipeline / Chronos2Pipeline / ChronosPipeline).
Also handle the dtype kwarg deprecation: try newer `dtype=` first,
fall back to `torch_dtype=` for older versions.
Test mock_pipeline fixture updated to patch BaseChronosPipeline.
45/45 tests pass. Verified amazon/chronos-bolt-base loads on CUDA.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>