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BFM-decomp/docs
Drew T cfa421eef2 docs(cookbook): §66d — the permuter/reader loop, and what transfers between giants
- The two halves of a 'not steerable from source order' note belong to different tools: the permuter
  closes INSN_LUID scheduler ties a hand sweep provably cannot enumerate; the reader closes semantic
  fixes the mutation set cannot invent. residual_class's bucket ([permuter] vs [structural]), already
  printed by match_one, is the free handoff signal; its profile feeds p16_permute --klass verbatim.
- Diagnose from a byte-verified SIBLING, and test the naive reading first: deleting the redundant mask
  alone COLLAPSED the copy (100 vs 101 ins), which is what proved a distinct PINNED register was needed.
- §66d-1: the LOOP transfers between giants, the PIN does not (the same move cost func_8014D820
  285 mismatched). §66d-2: setup() wipes the scratch dir; the cleanup pkill was global.
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