refactor(math): merge float kernels into ailego math

[zhangzhenghao]

Summary

• move the allocation-free float32 distance kernels from internal/floats into internal/ailego/math
• replace the amd64 L2, inner-product, and dot/norm kernels with direct C ports of Alibaba zvec's SSE, AVX, and AVX-512 implementations, preserving the *_distance_matrix_fp32_*.c source names
• dispatch SSE as the amd64 baseline, retain AVX small-dimension fallback behavior, and keep AVX-512 gated by AVX/FMA/AVX512F
• merge GoAT generation and QEMU test targets into internal/ailego/math/Makefile while retaining the existing checked and prevalidated Go APIs
• update GoAT to the merged float-return frame-size fix; use -fno-jump-tables for the currently unsupported amd64 switch jump table and retain arm64 output-pointer adapters

Verification

• go generate ./internal/ailego/math followed by git diff --exit-code
• go test ./... -count=1
• go test -tags noasm ./... -count=1
• go vet ./...
• make -C internal/ailego/math test-rvv
• make -C internal/ailego/math test-lasx
• Linux arm64 cross-compile + go vet, then complete math test binary under qemu-aarch64 -cpu max
• Windows amd64 and arm64 math test cross-compiles
• Clang -Wall -Wextra -Werror compilation for SSE, AVX, AVX-512, and NEON C sources
• git diff --check
• independent pre-commit review: passed

GoAT follow-ups

• amd64 generator panics on indirect jump from switch table goat#72: amd64 parser panic on indirect switch-table jumps
• arm64 frame size still includes return-value padding after #71 goat#73: arm64 return-value frame size still includes ABI padding after #71

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	xvec	ba4bb98	Aug 31 2026, 11:48 AM

[codecov]

Codecov Report

❌ Patch coverage is 78.94737% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.33%. Comparing base (d488a95) to head (67ceb41).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/ailego/math/distance_utility_amd64.go	71.42%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
- Coverage   82.45%   82.33%   -0.13%     
==========================================
  Files         122      122              
  Lines       26066    26068       +2     
==========================================
- Hits        21494    21463      -31     
- Misses       4572     4605      +33     

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