diff --git a/src/AcDream.UI.Abstractions/Panels/Debug/DebugPanel.cs b/src/AcDream.UI.Abstractions/Panels/Debug/DebugPanel.cs
index 2ee203d..bcf58be 100644
--- a/src/AcDream.UI.Abstractions/Panels/Debug/DebugPanel.cs
+++ b/src/AcDream.UI.Abstractions/Panels/Debug/DebugPanel.cs
@@ -254,6 +254,27 @@ public sealed class DebugPanel : IPanel
         if (r.Checkbox("Probe auto-walk (ACDREAM_PROBE_AUTOWALK)",
                        ref probeAutoWalk))                              _vm.ProbeAutoWalk = probeAutoWalk;
 
+        // ── Indoor rendering diagnostics (2026-05-19) ───────────────
+        // Pinpoint where the EnvCell rendering chain breaks for
+        // hypothesis-driven Phase 2 fix. Spec:
+        // docs/superpowers/specs/2026-05-19-indoor-cell-rendering-fix-design.md
+        r.Separator();
+        r.Text("Indoor rendering (envCell):");
+
+        bool probeIndoorAll    = _vm.ProbeIndoorAll;
+        bool probeIndoorWalk   = _vm.ProbeIndoorWalk;
+        bool probeIndoorLookup = _vm.ProbeIndoorLookup;
+        bool probeIndoorUpload = _vm.ProbeIndoorUpload;
+        bool probeIndoorXform  = _vm.ProbeIndoorXform;
+        bool probeIndoorCull   = _vm.ProbeIndoorCull;
+
+        if (r.Checkbox("Indoor: ALL (ACDREAM_PROBE_INDOOR_ALL)",       ref probeIndoorAll))    _vm.ProbeIndoorAll    = probeIndoorAll;
+        if (r.Checkbox("Indoor: walk (ACDREAM_PROBE_INDOOR_WALK)",     ref probeIndoorWalk))   _vm.ProbeIndoorWalk   = probeIndoorWalk;
+        if (r.Checkbox("Indoor: lookup (ACDREAM_PROBE_INDOOR_LOOKUP)", ref probeIndoorLookup)) _vm.ProbeIndoorLookup = probeIndoorLookup;
+        if (r.Checkbox("Indoor: upload (ACDREAM_PROBE_INDOOR_UPLOAD)", ref probeIndoorUpload)) _vm.ProbeIndoorUpload = probeIndoorUpload;
+        if (r.Checkbox("Indoor: xform (ACDREAM_PROBE_INDOOR_XFORM)",   ref probeIndoorXform))  _vm.ProbeIndoorXform  = probeIndoorXform;
+        if (r.Checkbox("Indoor: cull (ACDREAM_PROBE_INDOOR_CULL)",     ref probeIndoorCull))   _vm.ProbeIndoorCull   = probeIndoorCull;
+
         r.Spacing();
 
         // Cycle / toggle actions live on the VM as Action handles; the