Worker level optimization - #25
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… issues New tiling_method => 'hierarchical': splits the temporal extent into equi-count periods, then Z-order-buckets each period's trajectories into equi-count spatial chunks (num_periods/tiles_per_period auto-derived from num_tiles). Originally Citus-distributed the per-period assignment table for cross-worker concurrency, but that corrupted worker connections under load (reproducible at num_tiles=8+); reverted to a plain local table using intra-node parallel workers instead, verified reliable up to 16 tiles. Also, while building and testing the above: - Fix segmentation_and_allocation silently no-op'ing for sequence/sequenceset columns (substitution pattern never matched table-prefixed column refs) -- trajectories now genuinely clip via atStbox instead of copying through unclipped. - Fix shape_allocation missing a sequence/sequenceset branch (the "replicate whole trajectory into every overlapping tile" path errored out for MobilityDB tables), and tiling.segmentation never being set when shape_segmentation => false was passed. - Fix ORDER BY re-wrap in ConstructGeneralQuery referencing original table aliases not in scope after the wrapping subquery. - Auto-tune parallel-query GUCs for distribution (spec-derived from max_parallel_workers, transaction-local) and warn (don't silently change) when shared_buffers looks undersized relative to the table being distributed. - LZ4 TOAST compression on distributed output tables' trajectory column.
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