Fix crash recovery #29
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Move the pending batch check to BEFORE fetching a new batch from the stream. Previously, after a reorg was detected: 1. The data batch was stored as _pending_batch 2. A reorg batch was returned 3. On next __next__() call, a NEW batch was fetched BEFORE checking _pending_batch 4. This caused the pending batch to be lost or returned out of order Now the pending batch check happens first, ensuring proper ordering: reorg_batch -> pending_data_batch -> next_batch
On stream start, automatically clean up any data written after the last checkpoint watermark. This handles crash scenarios where data was written but the checkpoint was not saved. The _rewind_to_watermark method: 1. Gets the last watermark from state store 2. Creates invalidation ranges for blocks after the watermark 3. Calls _handle_reorg to delete uncommitted data 4. Falls back gracefully if loader does not support deletion Called automatically at start of load_stream_continuous once per table.
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