docs: refresh BENCHMARK.md division/parse/tostr tables post PRs #82–#89#91
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Re-measured 2026-06-11 with a focused paired BigMath-vs-GMP harness on the same size grids (GMP re-timed in the same run; mul tables left as 2026-05-30 values since multiplication code was untouched; the 100M/200M division rows are annotated as not re-measured). Headline movements: - skewed div 5M x 1M: 200.6 -> 111.4 ms (2.87x -> 1.59x vs GMP) - skewed div 50M x 10M: 2464 -> 1461 ms (1.86x -> 1.13x, near parity) - tostr 1M digits: 224.8 -> 170.2 ms (4.48x -> 3.31x) - tostr 20M: 5433 -> 3785 ms (2.52x -> 1.78x) - parse 1M: 49.0 -> 43.3 ms (2.33x -> 2.11x) Adds a session summary section (PRs #82-#89, one row per PR with headline wins, dispatch-state summary, and the two process lessons), linking to DIVISION.md / STRING_CONVERSION.md for the deep dives. ToString methodology matches the original table: warm best-of-N below 100k digits, single cold run (chain build included) at 100k+. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Re-measured the division (skewed + balanced), parse, and ToString tables on the 2026-05-30 size grids with a focused paired harness (GMP re-timed in the same run). Multiplication tables left at 2026-05-30 values — mul code untouched by the session. 100M/200M division rows annotated as not re-measured.
Also adds a "2026-06-11 division & decimal-IO session" summary section — one row per PR (#82–#89) with headline wins, the post-session dispatch state (no known shape holes), and the two process lessons (CPU-time ≠ wall-clock on the threaded stack; Newton tower drift ~B^6 ulps needs B^16 residue windows).
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