Postmortem-progression seam. Death is living-stop + postmortem-start:
living processes freeze and postmortem changes (algor / rigor / livor
/ decomposition) would begin here. v1 ships ZERO — returns []; the
seam exists for a future forensics wave.
The survivable band for a sign, from species profile or default.
Coarse part→slot coupling: a missing part disables its slots.
Remove a condition by reference; true if it was present.
Add a condition (a Trauma value or an AfflictionRecord).