anchored-iterative-merge-prevents-cumulative-compaction-drift
On subsequent compactions, only new content since the last compaction should be summarized, then merged into surviving sections — never full regeneration of previously compacted content. Full regeneration on each compaction causes cumulative drift where ‘low-priority’ details are progressively lost across cycles. The merge directive must explicitly instruct the model to preserve all prior compacted sections verbatim and only append new summaries.