TAC improvements#12220

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Commits on Jun 4, 2026

TAC improvements: kUInt128, kUInt32, kStringDict + adaptive LZ4 fallback

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fix CI builds: add FFOR bounds checks, decompress validation, gtest cleanup
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fix CI: relax strategy assertions on StringDict constant/long-comments tests
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fix: route only Arrow-standard offsets shape through kStringDict; LZ4 fallback for lengths shape

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perf: tighten kStringDict Guard 2 cap kDictBailoutMaxCheckRows 4096 -> 2048

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test: add positive PicksLz4 counterparts for StringDict constant/long-comments shapes

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fix: guard int64->int32 narrowing at TAC wire-header sites

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fix: validate FFor decompress value count in plain kFFor branch

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