Add opportunity-conditioned EgoSpeak event evaluation

PROJECT_CONTEXT.md

@@ -51,6 +51,11 @@ result.
   pools the 0.6--2.0-s wearer trajectory over equal-width 0.6-s causal decision
   regions. It preserves one score per annotated opportunity and never treats
   the longer annotation evidence interval as a scoring window.
+- An opportunity-conditioned dense-output evaluator aligns ENTRY positives and
+  core negatives at non-wearer releases, aligns INT positives and hold-floor
+  negatives at competing non-wearer onsets, and applies strict competing-risk
+  censoring. It uses only the original wearer probabilities, excludes wearer
+  backchannels from headline ENTRY FPR, and records unanchored/ambiguous cases.
 
 ### Measured screening result