Normalise a raw parti field to a canonical party key.
Maps missing, empty, or any capitalisation of 'unknown' to 'other'.
Used in both generateMotionsContent (party grouping) and
generateOppositionStrategySection so both sections treat the sentinel
identically regardless of capitalisation.
Normalise a raw
partifield to a canonical party key. Maps missing, empty, or any capitalisation of 'unknown' to 'other'. Used in both generateMotionsContent (party grouping) and generateOppositionStrategySection so both sections treat the sentinel identically regardless of capitalisation.