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Add `_load_diff_chains_async` to `AsyncPostgresSaver` and override `_load_checkpoint_tuple` to inline blob-parsing and diff-chain resolution via async point-lookup traversal, mirroring the sync `PostgresSaver._load_diff_chains` implementation. Add integration test `test_diff_channel_chain_reconstruction` that skips gracefully when `langgraph` core is not installed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>