Support Sapho ordering at Testing Station

docs/DISCOVERY_PROTOTYPE.md

@@ -1,5 +1,22 @@
 # Discovery functional prototype
 
+## Sapho at Ecological Testing Station — 29 October 2026
+
+**Prototyped / Partial.** Before either of two original occupants chooses,
+an eligible holder can discard Juice of Sapho to change its own choice to
+first or last. The original physical storm order, source and token are retained;
+both occupants still adjust the cumulative distance once. The reordered frame
+has a new event and a signed record of the original order. Unchanged frames
+retain their original signatures. A position already held, a completed choice,
+and another use after a recovered Sapho are not offered in this first version.
+Semuta reaction profiles are guarded until that separate discard continuation
+is connected. The ordering is a provisional online interpretation of Sapho's
+printed first/last effect; no combined publisher clarification is claimed.
+The current occupant may make its choice before the other occupant plays Sapho,
+including when an automated seat acts first. There is no neutral pre-choice
+priority window yet, so first-position intervention is not guaranteed against
+an automatically acting current occupant.
+
 13 September 2026. The connected Discovery batches are **Prototyped**, with
 partial rules coverage. It connects physical components, real actions, private
 controls, AI choices and saved continuation. Normal public Discovery and