feat(composer): replicate WorkBuddy branch label and context usage (TODO 21)

scripts/rea/probe-todo21-conversation.json

@@ -0,0 +1,9 @@
+{
+  "include_fonts": false,
+  "include_message_content": false,
+  "track_selectors": [".cr-input-footer", ".cr-status-chips"],
+  "actions": [
+    { "kind": "click", "step_id": "open-conversation", "selector": ".conversation-item .cb-agent-card", "index": 0, "frames": 1 },
+    { "kind": "wait", "step_id": "conversation-settled", "duration_ms": 1200, "frames": 1 }
+  ]
+}