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ef13489d63
When a histogram's hard_bounds are wider than the column's value range, the per-doc `bounds.contains` check can never fail. Collapse such bounds to the unbounded sentinel in `normalize_histogram_req`, so both the general histogram hot loop and the fused term×histogram path skip the check — the latter then derives per-term counts from the grid (the ~17% win) instead of falling back to per-doc counting just because `bounds != [MIN, MAX]`. Only the collect-time filter is affected: empty-bucket emission reads `req.hard_bounds` directly, and hard_bounds only ever clips that range, so a wider-than-data bound leaves results unchanged. Covered by new tests on the general and fused paths, including mid-interval (bucket-splitting) bounds. Also tighten the fused-path u32-overflow guard to bound on `num_vals()` (the per-value increment count) rather than `num_docs()`, and document why the fused collector's hot-loop fields are hoisted into locals (re-reading them from memory each iteration measured ~15% slower).