Add multi-query lexical skill selection - #33614
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## What changed - Add a lexical selector that splits compound queries into sentence and connector-delimited views. - Merge candidates across the full query and its component views, prioritizing their best rank while using full-query rank, view coverage, and stable identifiers as tie-breakers. - Bound query decomposition and result counts, propagate truncation signals, and include the selector in the shadow-selection experiment. ## Testing - Add unit coverage for compound-query ranking, single-query compatibility, query splitting, and bounded-input signals. GitOrigin-RevId: 2442bf7198fc24295cbc270b9d222275ae8a7cc3
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Add multi-query lexical skill selection
What changed
Testing