feat(mem_wal): FTS search for LSM scanner with Local and global-rescore modes#6910

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Commits on May 22, 2026

feat(mem_wal): LsmFtsSearchPlanner with Local mode + lance-index candidate APIs
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feat(mem_wal): wire LocalWithGlobalRescore mode in LsmFtsSearchPlanner
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bench(mem_wal): add lsm_fts_modes — Local vs Rescore on FineWeb
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bench(mem_wal): add mem_wal_fts_read_bench + storage sweep driver
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fix(bench): make mem_wal_fts_read flush generations deterministically
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fix(mem_wal): resolve flushed-gen FTS index via load_scalar_index criteria
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feat(mem_wal): flat candidate path for index-less flushed gens in rescore
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bench(mem_wal): index flushed generations in fts read bench
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reconcile(bench): drop manual flushed-gen indexing (built on flush in #6901)
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reconcile(bench): remove lsm_fts_modes in favor of mem_wal_fts_read_bench
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