smolvm v1.4.6

What's Changed

• Make the node data plane wedge-resilient: bound busctl calls and add a dispatch-readiness probe by @BinSquare in #560
• Add a /readyz dispatch-readiness probe that exercises the blocking pool by @BinSquare in #561
• Bump the workspace to 1.4.6 by @BinSquare in #562

Full Changelog: v1.4.5...v1.4.6