Add FP32 SAME-L + SAME-S TRT decoders

Pair the existing FP32 DiT engines (sa3-{m,sm-music,sm-sfx}/dit_fp32.trt) with
FP32 decoders so the consumer-side `--precision fp32` flag has a full
FP32-throughout pipeline available, bit-equivalent to PyTorch eager.

- same-l/dec_dynamic_fp32.trt — built by upcasting dec_dynamic_triton_swa.onnx
initializers + value_info + Constant nodes + Cast.to from FP16 to FP32
(STRONGLY_TYPED). The Triton SWA plugin already runs on the FP32 side of
the attention island, so the plugin contract is unchanged. ~1.7 GB.
- same-s/dec_dynamic_fp32.trt — analogous FP32 engine for SAME-S. ~210 MB.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tensorRT/sm_90/same-l/dec_dynamic_fp32.trt

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tensorRT/sm_90/same-s/dec_dynamic_fp32.trt

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