speedrunpapi v0.6.2 — Exact shared-input carry counts

Nine bounded exact mathematical operators. M-06 adds ordered carry-frontier masked counting with complete original-domain independent replay. The public source and result bundle reproduces 4 witnesses, least input 9 and six retained carry states from production job c456f437-8769-4452-9b5f-cd195bd3276e. Local npm tarball and Python wheel installed fresh and independently verified the source-bound result. Real card payment and external zkGolf comparator submission remain separate acceptance gates.