Test-only; builds. Ports Soul's feedback-1 s2 probes as behavioural tests that
observe where each rule is decided (the published AbsorbEvent, the handler's
view of hull and shield, Feedback.Cue, DrawAhead.Carried). The blast shield
Magnitude is read against an unshielded twin's totalShare so a scale mutant
fails. Covers findings shield-layer-fields-unpinned, blast-order-unpinned,
height-fixtures-at-zero and cue-saturation-edges-unpinned.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>