fix: close SSH channel denial of service in x/crypto - #6
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Upgrade the reviewed vendored golang.org/x/crypto module to v0.56.0 for CVE-2026-56855 and CVE-2026-78662. Preserve Docker Machine compatibility patches. Add tests at the actual SSH channel dispatch boundary for pre-establishment traffic, unexpected messages, and valid request/response behavior. Pin CI release artifacts to v0.39.7 and keep the existing OpenPGP applicability record aligned. Local Go race tests, focused SSH regression tests, vet, formatting and source validation pass; official CI remains required before release.