Round 2 verification audit for C069

Model: gpt-5

Claim: Drive (A) repeats the MS pulse twice with a motional phase shift of pi and an additional gap time of 3.2 us between the two segments.

Source alignment: source/supp_content.tex:133-133 (Supp. Mat. S5)

Prior official verdict: partial with failure_reason None.

Executable evidence: run.py. Sandbox rerun logs: run.log.

Independent audit: I scanned the copied script for imports/shared helper dependencies and reran it through the sandbox. The code is self-contained in this attempt directory and targets the claim strategy: Paper-reported pulse-sequence parameter; check consistency with the drive-(A) timing used elsewhere.. I checked the relevant family model rather than relying only on exit status; the rerun is treated as one reproducibility input.

Decision: Round 2 verdict is partial with failure_reason None and limitations ['paper_text_only_reimplementation']. Notes: Paper: drive (A) = MS pulse repeated twice with motional phase shift pi and a 3.2us gap between segments. These are directly reported pulse-sequence parameters, not derivable from physical constants. Consistency checks pass: the 3.2us gap equals (pi/2)/Omega_C=3.205us and drive-A total = 2*75+3.2 = 153.2us. Paper-reported sequence parameter -> partial.