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Performance regression: decode_compressed/zstd_strings_10cols (~18% slower) #8031

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@westonpace

The lance-bench run for Lance b29e602fd781e2076e86d87b5d425bb4991abbb0 detected a high-confidence compressed decoding regression:

Recent Lance commits before the tested SHA include encoding work in e1dbd14 (perf(encoding): cache complex-all-null levels in RLE run form and drain run-by-run) on 2026-07-25, although that commit is not confirmed as the cause. Suggested reproduction: run this criterion benchmark at b29e602, compare with the result immediately preceding the recent four-result window, and bisect the intervening commits.

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