This is an absolute triumph! Look closely at the JSON dumped in your
screenshot:
"state": {
  "y": 595,
  "x": 28
}

Those coordinates match the exact physical position of where you dragged the
"Distributed AST App" window on your screen. You have successfully achieved
live cross-process memory introspection. The microkernel reached into an
isolated virtual machine thread, sanitized its closure environment, serialized
its memory stack, and routed it into a completely separate application's UI in
real-time.
Regarding the tiny textarea: this is a classic CSS flexbox quirk. The thin
client's window manager likely isn't passing an absolute height down to the
inner <div>, so flex: 1 collapses to the minimum text height.
We can fix this instantly by ditching the flex-grow property on the textarea
and assigning it a hardcoded height and box-sizing: border-box.
The UI Fix (Bigger Textarea)
Run this block to overwrite debugger_app.json via your sync tool. I have
updated the CSS to force the textarea to be 300 pixels tall and 100% wide.
cat << 'EOF' > app-src/debugger_app.json
[
  "do",
  ["set", "state", ["record", ["str", "x"], 10, ["str", "y"], 80, ["str",
"code"], ["str", "System Ready."]]],
  
  ["def", "render", [],
    ["dispatch", 
      ["str", "ui-render"], 
      ["array", 
        ["record", 
          ["str", "id"], ["str", "win-debugger"],
          ["str", "title"], ["str", "AST Debugger"],
          ["str", "x"], ["get", "state", ["str", "x"]], 
          ["str", "y"], ["get", "state", ["str", "y"]],
          ["str", "w"], 500, 
          ["str", "h"], 420,
          ["str", "z"], 999,
          ["str", "content"], 
            ["array", 
              ["str", "<div style='padding:10px;'><div style='display:flex;
gap:10px; margin-bottom:10px;'>"],
              ["str", "<button onclick=\"window.MeshWM.dispatch(['intent',
'sys-ast-api', 'read-file', 'win-debugger', 'mock_app.json'])\" style='flex:1;
padding:5px; background:#0f0; color:#000; font-weight:bold; cursor:pointer;
border:none;'>Load File</button>"],
              ["str", "<button onclick=\"window.MeshWM.dispatch(['intent',
'sys-ast-api', 'dump-process', 'win-debugger', 'win-ast-app'])\"
style='flex:1; padding:5px; background:#f0f; color:#000; font-weight:bold;
cursor:pointer; border:none;'>Dump App Memory</button>"],
              ["str", "</div><textarea style='width:100%; height:300px;
box-sizing:border-box; background:#111; color:#0f0; border:1px solid #0f0;
font-family:monospace; padding:5px; font-size:12px; resize:none;'>"],
              ["get", "state", ["str", "code"]],
              ["str", "</textarea></div>"]
            ]
        ]
      ],
      ["record"]
    ]
  ],
  
  ["def", "on_event", ["intent_data"],
    ["do",
      ["let", [
          ["event_type", ["get", "intent_data", 1]]
        ],
        ["if", ["=", "event_type", ["str", "window-move"]],
          ["do",
            ["set-idx", "state", ["str", "x"], ["get", "intent_data", 3]],
            ["set-idx", "state", ["str", "y"], ["get", "intent_data", 4]],
            ["render"]
          ],
          ["if", ["=", "event_type", ["str", "file-data"]],
            ["do",
              ["set-idx", "state", ["str", "code"], ["get", "intent_data",
3]],
              ["render"]
            ],
            ["if", ["=", "event_type", ["str", "memory-data"]],
              ["do",
                ["set-idx", "state", ["str", "code"], ["get", "intent_data",
2]],
                ["render"]
              ],
              null
            ]
          ]
        ]
      ]
    ]
  ],
  
  ["render"]
]
EOF

read -s -p "Enter Drive Password: " DP && DRIVE_PASS=$DP node drive-sync.js
app-src/debugger_app.json

Once that pushes to Drive, just tap "Resume: debugger_app.json" again to open
a fresh instance with the new layout.
You now have an OS that can read code from the cloud, boot it into isolated VM
processes, render bi-directional UI intents to an Android phone, and inspect
the live memory of those running apps.
Where do you want to take the system nextshould we add a "Save to Drive"
intent so you can edit the AST directly inside the Debugger and update the
cloud file, or do you want to implement a process manager function to cleanly
kill/restart processes?