F32x16, F64x8, U8x64, I32x16, I64x8, U32x16, U64x8 — all composed
from 2× AVX2 halves (F32x8/F64x4 for float, array loops for integer).

Same API as simd_avx512.rs types. simd.rs will LazyLock-dispatch
between the two files based on runtime CPU detection.

Add/Sub/Mul/Div on F32x16 dispatch to 2× F32x8 operations (AVX2).
Integer types use array loops (AVX2 lacks 512-bit integer SIMD).

https://claude.ai/code/session_01BTATTRUACijvsK4hqmKUBR

simd.rs now re-exports from simd_avx2 (2× __m256 composed types)
instead of simd_avx512 (__m512 native) for all 512-bit types.

This eliminates the SIGILL risk on x86_64 without AVX-512.
The AVX2 composed types use 2× F32x8 per F32x16 operation —
correct on all hardware, 2 instructions instead of 1 on AVX-512.

BLAS hot paths (dot, axpy, gemm) still dispatch to AVX-512
kernels via native.rs LazyLock<Tier> — no performance regression
for inner loops. The simd.rs types serve HPC consumer code.

LazyLock<Tier> detection added to simd.rs (same pattern as native.rs).
F32x8/F64x4 (256-bit AVX2 base types) always re-exported from simd_avx512.

1422/1423 tests pass (1 pre-existing causal_diff failure).

https://claude.ai/code/session_01BTATTRUACijvsK4hqmKUBR

https://claude.ai/code/session_01BTATTRUACijvsK4hqmKUBR

- Remove burn from exclude list — all crates now in workspace
- Add [lib] section to burn Cargo.toml (edition 2024 requires explicit target)
- p64: 23 tests pass, phyllotactic-manifold: 14 tests pass
- Full workspace compiles clean

https://claude.ai/code/session_01BTATTRUACijvsK4hqmKUBR

https://claude.ai/code/session_01BTATTRUACijvsK4hqmKUBR

7 sections, 11 tests, zero new types — only mappings:

1. SIMD manifold: expand_manifold_simd() via F64x8 + SPIRAL7_X/Y
2. SIMD attention: attend_batch_8() with VPOPCNTDQ fast path via simd_caps()
3. NARS bridge: resonance_to_nars(), nars_to_branch_byte()
4. CausalEdge64 compat: bit layout, palette addressing, layer mask mapping
5. ThinkingStyle cache: 6 styles in LazyLock, ordinal + name lookup
6. Semiring mapping: semiring name → CombineMode + ContraMode
7. DeepNSM palette: distance matrix → Palette64 interaction bitmap

Re-exports: Palette64, Palette3D, ThinkingStyle, HeelPlanes,
CombineMode, ContraMode, predicate, manifold_consts

p64 + phyllotactic-manifold added as path deps in Cargo.toml.

https://claude.ai/code/session_01BTATTRUACijvsK4hqmKUBR