- Surface tilt magnitude stays visible 0-180 degrees; never blanked by
placement. Lock is self-gating (only near-zero magnitude can enter),
so the placement gate now drives hints only. Edge gating unchanged.
- Pitch/Roll suppressed as ambiguous at >=80 degrees; explicit
screen-down state past 90 degrees with the true magnitude retained.
- SurfacePresentationDetector classifies from the same deadbanded
stable magnitude the UI displays, with 1-degree hysteresis at both
boundaries and a direct face-up -> screen-down transition.
- Tests: angle sweep (30/80/near-vertical/screen-down), hysteretic
boundary tests, and a sustained 30-degree run proving a steep phone
never locks or fires feedback. 43 tests passing.
Audited-by: Claude (2 findings raised and resolved)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
thejayman77
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