openuniv_tests, rimtimsim_tests: clarity pass (Codex)

[rusholme]

Clarity and streamlining pass by Codex (gpt-6-astra, effort high), run unattended for Ben ("Unattended codex refinement of writing", 2026-09-28).

docs/source/dev/openuniv_tests.rst

Codex summary:

Rewrote only docs/source/dev/openuniv_tests.rst, retaining chronological records.
Clarified the overview and reduced total wording by about 16%.
Preservation and whitespace checks passed; commands, tables, identifiers and references remain intact.
Retained contradictions involving counts, W146, cov5percent, reference windows, SFFT descriptions and dates.
No rendered build: Sphinx and Docutils are unavailable locally.

Words: 10341 -> 8731.
Fact check (scripted: labels, ref and link targets, URLs, backticked spans, code lines, integers, dated rulings): 0 item(s) missing after the rewrite, 0 restore call(s); none missing against the current tip.

docs/source/dev/rimtimsim_tests.rst

Codex summary:

(Codex's final message was empty; the diff is the record.)

Words: 4415 -> 3536.
Fact check (scripted: labels, ref and link targets, URLs, backticked spans, code lines, integers, dated rulings): 0 item(s) missing after the rewrite, 0 restore call(s); none missing against the current tip.

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