P1 follow-up: upload top-level validation/results/*.png

P1 follow-up: upload top-level validation/results/*.csv (missed by recursive glob)

P1 follow-up: upload validation/results PNGs + txt sidecars

P1 follow-up: upload validation/results/**/*.dat (G4 scattering function tables)

add tier-discipline README (ADR-049 §Part 6)

initial upload: gate2_golden/*.parquet (ADR-049 §Part 6 P1)

initial upload: validation/controlled/**/*_brep.strata (ADR-049 §Part 6 P1)

initial upload: validation/results/*.csv (ADR-049 §Part 6 P1)

initial commit