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zeekay 85546f0472 banderwagon: extract canonical home, ipa imports from here
The Banderwagon prime-order group used by Verkle / IPA had been vendored
internally under lux/crypto/ipa/banderwagon. Extract it to
lux/crypto/banderwagon as the canonical Lux public surface; rewrite all
internal ipa callers (prover, verifier, config, multiproof, common,
transcript, test_helper, tests) to import from the canonical home.

- Provenance comment on every file: github.com/crate-crypto/go-ipa
  (Apache-2.0 / MIT dual). Adds LICENSE-GO-IPA-APACHE2 and
  LICENSE-GO-IPA-MIT alongside the package.
- Element / Generator / Identity / Fr / MSMPrecomp / PrecompPoint /
  CompressedSize / UncompressedSize / SetBytes / SetBytesUncompressed /
  ElementsToBytes / BatchToBytesUncompressed / BatchNormalize /
  MapToScalarField / BatchMapToScalarField / Add / Sub / Double / Neg /
  ScalarMul / MultiExp now have one and only one home: lux/crypto/banderwagon.
- Verkle (parallel branch) will switch its banderwagon import to this
  canonical surface.
- KAT vectors from the upstream go-ipa Verkle reference suite preserved
  (TestEncodingFixedVectors, TestPointAtInfinityComponent) plus all
  precomp MSM-vs-gnark random-round tests (1000 * NumCPU rounds).

Tests: go test ./banderwagon/... ./ipa/... — all PASS (banderwagon 27s,
ipa 16s, ipa/bandersnatch 24s, fp/fr 4s+2s, common 3s).
2025-12-28 06:21:30 -08:00

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