Canonical (sorted-key) JSON serialization of the full durable checkpoint,
for persistence where the caller owns access control. Two checkpoints
with the same accepted content always serialize identically, regardless
of property insertion order — required for content-addressed storage and
for stable diffing across processes.
Canonical (sorted-key) JSON serialization of the full durable checkpoint, for persistence where the caller owns access control. Two checkpoints with the same accepted content always serialize identically, regardless of property insertion order — required for content-addressed storage and for stable diffing across processes.