sail: implement HL.BFI (wrap-around bitfield insert)#74
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Implements HL.BFI semantics by reusing the existing BXU/BXS wrap-around bitfield model (
bitfield_wrap).User-confirmed semantics: insert into the destination bitfield at the same wrap position {m,n} (option B). Implementation: rotate-right by m, clear low n bits, OR field, rotate-left by m.
Coverage: implemented_forms 495 -> 496 (+1 form).
NOTE: per team rule, do not merge coverage-only PRs until cumulative delta >= 5% unless explicitly requested.