GT5U 5.09.54.205 casts reduceMOP(hit)._1() to Integer to find the struck
ProjectRed wire. Give Java callers the same index without Scala types.
- hitPartIndex returns the jPartList index recorded by rayTraceAll, or -1
when the hit carries no part index
- reduceMOP and its companion are unchanged and not deprecated; tests now
pin the boxed Integer index and the rebased hit
- Add HitPartExample and the HIT_PART guide, link it from the API index
- Record the replacement in the compatibility ledger
