Document current y_ready caveat

Briefly note that y_ready still gates on low oven-door angular speed, which can delay the reveal-to-retrieve boundary when the retriever arm nudges the door during approach.

README.md

@@ -77,6 +77,8 @@ The main new fix in `iter24` is the assisted-door contact scoring inside `p_pre`
 
 The current repo state should therefore be treated as the repaired benchmark snapshot with geometry-aware door assistance, not the final metric design.
 
+Brief caveat: the current `y_ready` label still gates on low oven-door angular speed after extraction feasibility persists. In this task, the retriever arm can legitimately nudge the door while already committing to retrieval, so `y_ready` can still switch later than the true reveal-to-retrieve boundary. Treat that as a known label-design limitation in the current artifacts.
+
 ## What Is In This Upload
 
 - `code/rr_label_study/`