Faithful JSR/RTS stack semantics; the ghost cluster-trap was lost abort semantics

JSR was a bare C call (no return-address push) and RTS a bare C return. Two corpus-wide consequences: (a) the universal "first-valid-wins" abort idiom (try-routine stores result, PLA/PLA discards the return address, RTS returns TWO levels) didn't abort — every direction try ran and the LAST valid one won.

Raw traces, ROM material, local paths, and personal data are not part of this public record.