Default stays the pinned 0.30 shade cloth (asserted: omitting porosity ===
explicit 0.30 to the digit, hp and every corner peak), so no pinned number
moves. porosity 0 flies genuinely heavier (per-corner strictly greater,
measured 1.23x average on the synthetic funnel yard). C's storm_06 gate-3.1
membrane-vs-cloth pin and B's membrane-balance tables ride this seam.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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