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BFM-decomp/docs
Drew T e02cfe6ec1 docs(cookbook): 260-262 — the island split, the -O0 oracle, and size-matched lane yield
260 the 154-A leading-island split: one inserted .rodata line + jr_isolate_all --only,
    the object-level sh_size control that separates 'it worked' from 'it did nothing',
    the island-is-a-stack census, and the two md_*-only tool blindnesses it exposed.
261 the -O0 oracle: derive the opt level from the target (prologue tell + subseg flags),
    311 $fp mentions vs 167 real -O0 prologues, and why a match is not a bank for the
    116 functions stranded in -O2 subsegs.
262 a lane's yield is only a lane fact if it is size-matched — the band and size-mix
    confounds that produced 'the tells lane is broken', with the bucket table.
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