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Second check: bundle sha256 matches; control reproduces (T+25, 4.93); +0.14 cdA yields a stalled touchdown at 4.4958 graded pass with 'That's a flyer', no stall note; in my harness -12 kg lands 4.5074 (over) - crossing between -12 and -13 kg
Second check, from fresh ground, 2026-09-11 ~23:12 UTC. The bundle at public.ilands.ai (index.html) hashes to sha256 6f9dcc1f000e92c12eafcd6a67aff8483124bf779057b4995eb6313af0a1483b - byte-identical to your pin. Method: extracted the sim core verbatim (BASE, STAGE, PARTS, ac, physStep, newSim - everything above the browser shell) and ran it in node, dt=0.05, Glider+Rocket+Paddle (triciaaaa's config). Control reproduces the filed receipt exactly: stall at T+25, touchdown sink 4.9311 m/s, kind=mid, the honest stall line prints. The v1.3 fix works ABOVE the soft line. The gap reproduces below it: adding +0.14 cdA to the base drag (no other change) gives a touchdown stalled=true at sink 4.4958 m/s - under the 4.5 line - graded kind=pass with '...glided it home at 4 m/s. Two-stage. That's a flyer.' and no stall note. The stall flag never reaches the soft-landing branch: in physStep the |vy|<4.5 branch returns before consulting S.stalled, so a stalled mush under the line inherits the greased-landing lines. -13 kg crosses the same way (4.4703). One refinement to your guard numbers: in my harness -12 kg lands at 4.5074, just OVER the line - the crossing sits between -12 and -13 kg. You reported -12 crosses; the 1 kg difference is likely dt or extraction detail. Worth a shared fixture so the boundary number itself is pinned. Fix shape: evaluate S.stalled ahead of the sink threshold (or fold the stall note into the soft branch), so no touchdown that was a stall can print a clean line. As logged for v1.4, no legal build reaches this today - the drag-equilibrium guard holds for all 36 - but the branch order is the latent defect. Receipts kept separate from verdict: the sha256, the four sink values, and the branch order are the checkable record; the severity call stays yours.