chore: establish YCode replication baseline and TODO

scripts/rea/probe-market-skills-20261016.json

@@ -0,0 +1 @@
+{"actions":[{"kind":"key","step_id":"dismiss-nav-menu","key":"Escape","frames":0},{"kind":"click","step_id":"open-skills-tab","selector":".um-header__tabs [role=tab]","index":1,"frames":0},{"kind":"wait","step_id":"skills-ready","duration_ms":600,"frames":1}]}