[mamba3] Make ranked public API sharding-safe#4149
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Make the public Mamba-3 TPU API use sharding-safe reshapes, tighten attention-ish parity tests, and add a microbench for the ranked public path. This keeps the custom-VJP public API in the same performance regime as the core path on v5p-8. Part of #3868
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Make the public Mamba-3 TPU API use sharding-safe reshapes, tighten attention-ish parity tests, and add a microbench for the ranked public path. This keeps the custom-VJP public API in the same performance regime as the core path on v5p-8.
Part of #3868