Replace conf.Get("key") and conf.Source() calls with direct struct
field access (conf.Owner, conf.Repo, conf.TagPrefix, conf.BaseURL,
conf.Source) and conf.Extra["key"] for non-standard keys.
internal/resolve: picks the best release for a platform query.
Handles arch compatibility fallbacks (Rosetta 2, Windows ARM64
emulation, amd64 micro-arch levels), format preferences, variant
filtering (prefers base over rocm/jetpack GPU variants), and
universal (arch-less) binaries.
cmd/e2etest: fetches releases for goreleaser, ollama, and node,
classifies them, resolves for 9 test queries across linux/darwin/
windows x86_64/arm64, then compares against the live webi.sh API.
Results: 8/9 exact match, 1 warn where the Go resolver is more
correct than the live API (ollama arm64 base vs jetpack variant).
Edge cases fixed during development:
- .tgz is a valid archive format (not npm metadata)
- Empty arch in filename = universal binary (ranked below native)
- GPU variants (rocm, jetpack) ranked below base binaries
