release: wire GoReleaser + Homebrew tap for v0.7.0

[zpenka]

Summary

• .goreleaser.yaml: multi-arch builds (darwin/linux x amd64/arm64, CGO_ENABLED=0), tar.gz archives, checksums, and a Homebrew formula pushed to zpenka/homebrew-lore on each tagged release
• .github/workflows/release.yml: triggers on v* tag pushes; runs GoReleaser v2 with GITHUB_TOKEN + HOMEBREW_TAP_GITHUB_TOKEN
• lore.go: Version promoted from const to var (so GoReleaser ldflags can override it at link time); bumped to 0.7.0
• README.md: brew install zpenka/lore/lore added to quick start

Before merging -- one-time setup required

1. Create the tap repo: create a new public repo named homebrew-lore under your zpenka account. It can be empty; GoReleaser pushes the formula on first release.

2. Add the tap token secret: in zpenka/lore Settings > Secrets > Actions, add a secret named HOMEBREW_TAP_GITHUB_TOKEN whose value is a fine-grained PAT (or classic PAT with repo scope) that has write access to zpenka/homebrew-lore.

Cutting the first release (after merging)

git tag v0.7.0
git push origin v0.7.0

The Release workflow fires, GoReleaser builds the binaries, creates the GitHub Release, and updates the Homebrew tap. Users install with:

brew install zpenka/lore/lore

Test plan

• go test -race ./... -- all pass
• go vet ./... -- clean
• gofmt -l . -- clean
• TestVersionConstant still passes with var Version

Commit: 5d67877

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