feat: add deployment foundation and cross-device handoff

internal/state/lock_unsupported.go

@@ -0,0 +1,13 @@
+//go:build !linux && !windows
+
+package state
+
+import (
+	"errors"
+	"os"
+)
+
+func lockExclusive(*os.File) error {
+	return errors.New("operation store supports Linux and Windows only")
+}
+func syncDirectory(*os.Root) error { return errors.New("unsupported state durability platform") }