feat(tui): add internal debug frames

packages/opencode/src/cli/cmd/tui/debug/fixtures/subagent-lifecycle.json

@@ -0,0 +1,106 @@
+{
+  "name": "subagent-lifecycle",
+  "frames": {
+    "running": {
+      "prompt": "Preview a foreground subagent while it is reading.",
+      "parts": [
+        { "type": "text", "text": "Running delegated work:" },
+        {
+          "type": "subagent",
+          "agent": "explore",
+          "description": "Inspect renderer",
+          "state": "running",
+          "childTools": [
+            {
+              "tool": "read",
+              "title": "src/cli/cmd/tui/routes/session/index.tsx",
+              "input": { "filePath": "src/cli/cmd/tui/routes/session/index.tsx" }
+            }
+          ]
+        }
+      ]
+    },
+    "active-background": {
+      "prompt": "Preview a launched background subagent whose child is still reading.",
+      "parts": [
+        { "type": "text", "text": "Active background work:" },
+        {
+          "type": "subagent",
+          "agent": "explore",
+          "description": "Inspect renderer",
+          "state": "active-background",
+          "childTools": [
+            {
+              "tool": "read",
+              "title": "src/cli/cmd/tui/routes/session/index.tsx",
+              "input": { "filePath": "src/cli/cmd/tui/routes/session/index.tsx" }
+            }
+          ]
+        }
+      ]
+    },
+    "retrying": {
+      "prompt": "Preview a background subagent retrying an upstream request.",
+      "parts": [
+        {
+          "type": "subagent",
+          "agent": "explore",
+          "description": "Retry provider request while maintaining context",
+          "state": "retrying",
+          "background": true,
+          "message": "Rate limited by provider; retrying after quota window",
+          "attempt": 2
+        }
+      ]
+    },
+    "failed": {
+      "prompt": "Preview a delegated task failure.",
+      "parts": [
+        {
+          "type": "subagent",
+          "agent": "general",
+          "description": "Fail delegated work after checking upstream status",
+          "state": "error",
+          "error": "Provider returned an authentication error"
+        }
+      ]
+    },
+    "completed": {
+      "prompt": "Preview completed foreground and background subagents.",
+      "parts": [
+        { "type": "text", "text": "Completed delegated work:" },
+        {
+          "type": "subagent",
+          "agent": "general",
+          "description": "Answer directly",
+          "state": "completed",
+          "durationMs": 501
+        },
+        {
+          "type": "subagent",
+          "agent": "general",
+          "description": "Answer directly",
+          "background": true,
+          "state": "completed",
+          "durationMs": 501
+        },
+        {
+          "type": "subagent",
+          "agent": "explore",
+          "description": "Inspect renderer",
+          "background": true,
+          "state": "completed",
+          "durationMs": 501,
+          "childTools": [
+            {
+              "tool": "read",
+              "title": "src/cli/cmd/tui/routes/session/index.tsx",
+              "state": "completed",
+              "input": { "filePath": "src/cli/cmd/tui/routes/session/index.tsx" }
+            }
+          ]
+        }
+      ]
+    }
+  }
+}