Review round 2: gate the well-posed grid clause on…

Details

Round-2 verification passed on all four lenses (0 unresolved, 0 high
regressions). Its one low finding: the "coverage makes the collinear fit
well-posed" reference clause fired in Regime A too, contradicting the
single-ray window's own "ill-conditioned, extrapolation can't be trusted"
copy. Now regime-aware — in Regime A it reads "the grid's fit stays well-posed
where this narrow collinear window can't."
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014c7dbCGbQxtWedKRSx4sJi

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