Release binaries for linux amd64 and arm64
Pushing a v* tag runs .github/workflows/release.yml: vet, test, govulncheck, then scripts/build-release.sh builds reproducible archives for linux/amd64 and linux/arm64 with a SHA256SUMS file, and attaches them to the release. workflow_dispatch takes a tag for a run that never started. Same shape as ihasmail-oneshot's releases. Adds a version subcommand, set at build time. go.mod moves to 1.26.8: the workflow builds with the go.mod version, and govulncheck finds four standard-library vulnerabilities the tool reaches in 1.26.5 (GO-2026-6218, GO-2026-6090, GO-2026-5972, GO-2026-5026), all fixed in 1.26.6. README installs from the latest release, with building from source as the alternative; CONTRIBUTING describes how releases are cut.
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