docs: add engine refactor implementation plan

11 tasks across 3 chunks: extract AccumulatingProgress, ShrinkFiller,
AngleCandidateBuilder, PairFiller, RemnantFiller, then rewire both
engines and NestEngineBase.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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2026-03-16 22:05:51 -04:00
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