2026-07-13 (itd-85 M7): acknowledged repolinter (rule schema) and Conftest

2026-07-13 (itd-85 M7): acknowledged repolinter (rule schema) and Conftest (severity/exit vocabulary) in ACKNOWLEDGEMENTS now, since both are actually adapted in the shipped audit engine. DEFERRED the SARIF acknowledgement to P3: the serializer seam is shaped for SARIF but no SARIF is emitted yet, and the convention is to credit a pattern in the change that lands it, never ahead. Add the SARIF entry when the --format sarif serializer ships.