Implement Backend interface with Probe/Get/Put methods, ProbeState constants, and LocalBackend using filesystem storage with atomic operations and hash verification. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Implement Backend interface with Probe/Get/Put methods, ProbeState constants, and LocalBackend using filesystem storage with atomic operations and hash verification. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>