Updated Multisession3ItMemoryThr flaky test checks

[matlabbe]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.36%. Comparing base (d494063) to head (cf2c3a1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1758      +/-   ##
==========================================
- Coverage   61.37%   61.36%   -0.01%     
==========================================
  Files         291      291              
  Lines       51231    51231              
==========================================
- Hits        31441    31436       -5     
- Misses      19790    19795       +5     

see 1 file with indirect coverage changes

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[fallenmi]

The new adjacent-variant margin addresses the observed cross-run reversal without removing the regression signal. At exact head cf2c3a1, the old assertion rejects the documented local=0.0956 / none=0.0946 pair, while the new strict +0.015 bound accepts that 0.001 reversal and still rejects a reversal at or beyond the margin. The two independent both-retrieval < ... assertions are retained, so a collapse of the configured retrieval benefit remains a failure.

I compiled and ran boundary cases against the exact base/head assertion logic. I also inspected the exact-head macOS Sequoia run: 18/18 CTest targets passed, and Multisession3ItMemoryThr ran (not skipped) and passed in 175.981 seconds, with mean value differences of 0.0461745 (both retrieval), 0.075264 (local only), and 0.0932199 (none).

AI disclosure: I used OpenAI Codex to assist this review; I verified the source and evidence against exact head cf2c3a156659426e1fd713e78c3f7ce9022f82ff.