Langfuse 4.29 and 4.30 rebuild experiments around score columns and add a worse-than-comparison filter

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Shipped roughly an hour apart on 2026-09-04, the two releases replace the experiments chart grid with a single compact metric strip, drop the empty Analytics tab, make the comparison selectable, grouped and pre-picked, then rebuild the results grid around score columns and add a worse-than-comparison filter plus a score-by-run matrix (#16914 through #16918). 4.29 also gates public-API project routes through the policy seam in all migration modes (#16661) and enables ClickHouse block columns for lightweight updates (#17027).