docs: explain two-phase flow-sequence handling in sync()#53
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Documents the proactive/reactive split in
Document.sync()that was previously unexplained.Phase 1 (
_flow_seq_replacements) pre-converts only the affected flow sequences so that nested list indentation is preserved. A full replace at a higher path would re-serialise the whole mapping with 2-space indentation.Phase 2 (the
except PatchErrorfallback) catches cases phase 1 misses — primarily list reordering, where new diff indices weren't in the original tree.