feat(hpc): implement jitson shopping list — SIMD upgrades + terrain t…#30
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…emplates Phase 1: AVX-512 upgrades to byte_scan (64 bytes/cycle), property_mask (VPTERNLOGD + VPOPCNTDQ), and palette_codec (generic unpack/pack all bit widths 1-8). Phase 2: nibble.rs gets AVX2 batch unpack (32 nibbles/cycle), AVX2 threshold scan, AVX-512 sub_clamp (128 nibbles/cycle), and new nibble_propagate_bfs composing existing SIMD kernels for light BFS decay. Phase 3: aabb.rs gets AVX-512 batch intersect (16 candidates/iter) and new Ray struct + ray_aabb_slab_test_batch for projectile collision. Phase 4: spatial_hash.rs gets query_radius_simd with AVX2 batch squared distance filtering. Phase 5: jitson/noise.rs gets TerrainFillParams (baked biome params for JIT terrain fill) and CompiledNoiseConfig (flattened octave params for JIT compilation). All SIMD paths dispatch at runtime (AVX-512 > AVX2 > scalar), include SAFETY comments, and have parity tests. 1219 lib tests pass, clippy clean. https://claude.ai/code/session_01CdqyUTUfjKZuk8YGJzv6LB
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…emplates
Phase 1: AVX-512 upgrades to byte_scan (64 bytes/cycle), property_mask (VPTERNLOGD + VPOPCNTDQ), and palette_codec (generic unpack/pack all bit widths 1-8).
Phase 2: nibble.rs gets AVX2 batch unpack (32 nibbles/cycle), AVX2 threshold scan, AVX-512 sub_clamp (128 nibbles/cycle), and new nibble_propagate_bfs composing existing SIMD kernels for light BFS decay.
Phase 3: aabb.rs gets AVX-512 batch intersect (16 candidates/iter) and new Ray struct + ray_aabb_slab_test_batch for projectile collision.
Phase 4: spatial_hash.rs gets query_radius_simd with AVX2 batch squared distance filtering.
Phase 5: jitson/noise.rs gets TerrainFillParams (baked biome params for JIT terrain fill) and CompiledNoiseConfig (flattened octave params for JIT compilation).
All SIMD paths dispatch at runtime (AVX-512 > AVX2 > scalar), include SAFETY comments, and have parity tests. 1219 lib tests pass, clippy clean.
https://claude.ai/code/session_01CdqyUTUfjKZuk8YGJzv6LB