refactor(hpc): bf16_tile_gemm fallback delegates to the polyfill (dedup of #222)

[AdaWorldAPI]

Follow-up to #222.

#222 added ndarray::simd::bf16_tile_gemm_16x16 by copying the F32x16 kernel out of hpc::bf16_tile_gemm::fallback_path — leaving the same BF16 GEMM in two places.

This collapses it to one source of truth:

• simd::bf16_tile_gemm_16x16 (the polyfill primitive) is the single kernel.
• hpc::bf16_tile_gemm's fallback now just calls crate::simd::bf16_tile_gemm_16x16; its AMX TDPBF16PS tile path stays layered on top for AMX hosts.
• Drops the now-unused F32x16 / bf16_to_f32_batch import.

Net: +1 caller, −30 duplicated lines. Both test suites pass (hpc::bf16_tile_gemm::tests::fallback_matches_scalar_reference_k64 + simd_ops::bf16_tile_gemm_tests::{matches_scalar_reference_k64, accumulates_into_c}); clippy -D warnings + fmt clean on rustc 1.95.

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https://claude.ai/code/session_01GJ4NVBSjq1w5h7RmTbVafb

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Reviewing files that changed from the base of the PR and between 7a8b793 and 341216d.

📒 Files selected for processing (1)

• src/hpc/bf16_tile_gemm.rs

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