chore: establish YCode replication baseline and TODO

scripts/rea/probe-expert-entry-20261016.json

@@ -0,0 +1 @@
+{"track_selectors":[".conversation-list-tabs"],"actions":[{"kind":"click","step_id":"open-expert-entry","selector":".conversation-list-tabs button[role=tab]","index":2,"frames":0},{"kind":"wait","step_id":"expert-entry-ready","duration_ms":500,"frames":1}]}