chore(tests): prune obsolete probes and define truthful offline test gates

scripts/rea/probe-add-skill-options-20261016.json

@@ -1 +0,0 @@
-{"actions":[{"kind":"click","step_id":"back-to-skills-market","selector":".sm-installed-topbar-nav","frames":0},{"kind":"wait","step_id":"market-ready","duration_ms":200,"frames":0},{"kind":"click","step_id":"open-add-skill-options","selector":".sm-topbar-action-btn[aria-label='添加技能']","frames":0},{"kind":"wait","step_id":"add-skill-options-ready","duration_ms":300,"frames":1},{"kind":"key","step_id":"dismiss-add-skill-options","key":"Escape","frames":0}]}