Re-run dumi for suite P in round 2026-10-11 #38

Round 2026-10-11 has no result for dumi in suite P (50 pages × 5 KB): the run finished, but its artifact upload failed on a file name with a colon in the copied quality site (#26).

• Fix benchmark-round: artifact upload fails when a quality site copy has ':' in a path #26.
• Re-run dumi for suite P, cell nf50-cs5, with the round's toolset.
• Merge its results.json into docs/results/2026-10-11/P/ (after docs(results): round 2026-10-11 with 63 generators #37) and regenerate suite-summary.csv/.md and quality-summary.csv.
• Bump the data/benchmark-tool submodule in BenchCommons/website-results.

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