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

scripts/rea/probe-todo15-open-agents-dark.json

@@ -1,14 +0,0 @@
-{
-  "include_fonts": false,
-  "include_message_content": false,
-  "track_selectors": [
-    ".settings-navigation__item--active",
-    ".settings-modal__panel",
-    ".settings-navigation",
-    ".settings-navigation__item"
-  ],
-  "actions": [
-    { "kind": "click", "step_id": "open-agents-by-observed-nav-index-7-in-dark-theme", "selector": ".settings-navigation__item", "index": 7, "frames": 1 },
-    { "kind": "wait", "step_id": "verify-agents-dark-page-stable", "duration_ms": 800, "frames": 2 }
-  ]
-}