The handoff's 'eye-below-grade membership demote' diagnosis is REFUTED.
The harness drives the production stack headlessly per step of the
A9B4 corner-building cellar ascent (0x0174 -> 0x0175 -> 0x0171, path
fitted from the cellar-up live captures): FindCellList on the
foot-sphere center for the player pick + the PhysicsCameraCollisionProbe
SweepEye chain mirrored verbatim (AdjustPosition at pivot ->
ResolveWithTransition IsViewer|PathClipped|FreeRotate|PerfectClip ->
both fallbacks) with per-step branch attribution.
Result: 0 outdoor/null viewer resolutions while the eye is below grade,
0 sweep failures, 0 fallback branches, across boom distance {2.61, 5}
x damping lag {0, 0.3 m}. The viewer enters the main-floor room at eye
z 94.01 - exactly as the head pops above grade (the stairwell portal
sits AT grade), matching the user's report wording. The root is
INTERIOR for the whole grass window; #108-residual is render-side
(fix in the next commit). Tests stay as the healthy-layer
characterization pin.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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