test(web): heldMs bounds in server-boundary-records are timer-deterministic

[ryansolid]

a grouped boundary that errors still records failed CI on #3526 (heldMs 7.28 against a >= 10 floor). The hold is the gap between two independent timers — a 5 ms error and a 20 ms sibling — and on a loaded runner they raced.

Now the sibling settles a fixed 30 ms after A has failed (a deferred A resolves just before it throws), so the hold's lower bound is one timer's, and a timer never fires early; floor 25. Same treatment for order=together: B is released 40 ms after A has settled, not after the stream started; floors 35 / 40; A's duration is asserted shorter than its own hold instead of under a wall-clock constant. The order=natural test only asserts < 10 on an un-held reveal and is unchanged.

Test-only. Passes 6/6 locally in isolation; the other six failures in this file locally are the pre-existing compiler-binary ones that also fail on origin/next in my worktree.

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[coveralls]

Coverage Report for CI Build 35310559831

Coverage remained the same at 71.304%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

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Relevant Lines:	1035
Covered Lines:	783
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[codspeed]

Merging this PR will not alter performance

✅ 172 untouched benchmarks
⏩ 3 skipped benchmarks¹

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_{Comparing test/deterministic-held-ms (e308f39) with next (e1e9f8c)²}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on next (e308f39) during the generation of this report, so e1e9f8c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩