Clarify sort direction (ascending, keep nearest to origin), document
parameter changes, MeasureDimension behavior, and behavioral trade-off.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace expensive ShrinkFiller re-fill loop with axis-aware edge-sorted
trim. Also replaces blind Take(N) in DefaultNestEngine.Fill.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>