Add temporalFooter for TemporalParquet KV_METADATA#146
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temporalFooter builds the TemporalParquet footer-metadata JSON manifest for COPY ... TO '*.parquet', faithful to the ratified opaque-MEOS-WKB spec. The test covers the deterministic footer assertions and the KV_METADATA round-trip. End-to-end MEOS-WKB round-trip and native-scalar sidecar pushdown coverage are deferred to a follow-up gated on the MobilityDuck binding-stability fix, since exercising many sequential MEOS calls in one process trips a pre-existing non-deterministic native crash tracked in a separate lane.
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temporalFooter builds the TemporalParquet footer-metadata JSON manifest for COPY ... TO '*.parquet', faithful to the ratified opaque-MEOS-WKB spec. The test covers the deterministic footer assertions and the KV_METADATA round-trip. Stacked on #134 (fix/bump-meos-pin) because current main pins a pre-MeosType MEOS that no longer compiles; base retargets to main once #134 lands. End-to-end MEOS-WKB round-trip and native-scalar sidecar pushdown coverage are deferred to a follow-up gated on the MobilityDuck binding-stability fix, since exercising many sequential MEOS calls in one process trips a pre-existing non-deterministic native crash tracked in a separate lane.