diff --git a/CHANGELOG.md b/CHANGELOG.md
index b545a9e..8f279eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 ## [Unreleased]
 
 ### Changed
+- **Studio namespace migration.** Four-phase navigation, DOM borrowing, resume state, and cast-footer coordination now
+  use a private scope with explicit compatibility exports and a tested `window.TTVC.studio` surface.
 - **Rehearser cast namespace migration.** Cast view rendering, filtering, sorting, and delegated controls now use a
   private scope with explicit compatibility exports and the existing cast namespace.
 - **Rehearser voice-design namespace migration.** Character development and backend-refresh controls now use a private
diff --git a/VERSION b/VERSION
index 210789c..0e70316 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.24.71
+1.24.72
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index ec7ca60..c701594 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -61,6 +61,7 @@ Done incrementally as global-scope ordered files (no ES-module change needed) 
 - ✅ Rehearser voice-picker uses a private scope with explicit preview, search, and assignment compatibility exports.
 - ✅ Rehearser voice-design uses a private scope with explicit development and backend-refresh compatibility exports.
 - ✅ Rehearser cast rendering uses a private scope with explicit view/filter/sort compatibility exports.
+- ✅ Studio navigation and DOM-borrowing coordination use a private scope with explicit compatibility exports.
 - ✅ `static/css/resource-diagnostics.css` — isolated Performance/resource diagnostic panel styles.
 - ✅ `static/css/background-jobs.css` — isolated background-job history and retry-panel styles.
 - ✅ `static/css/voice-design.css` — isolated Voice Design form, samples, and preview-match styles.
diff --git a/static/index.html b/static/index.html
index e205f87..64487a8 100644
--- a/static/index.html
+++ b/static/index.html
@@ -10,7 +10,7 @@
   <meta name="format-detection" content="telephone=no">
   <meta name="color-scheme" content="light dark">
   <meta name="theme-color" content="#2563EB">
-  <meta name="app-version" content="1.24.71">
+  <meta name="app-version" content="1.24.72">
   <link rel="manifest" href="/manifest.webmanifest">
   <link rel="icon" href="/static/icon.svg" type="image/svg+xml">
   <link rel="apple-touch-icon" href="/static/icon.svg">
@@ -27,12 +27,12 @@
 
   <!-- ── Core styles (local — no CDN dependency for first paint) ────────── -->
   <link rel="stylesheet" href="/static/vendor/mdi/materialdesignicons.min.css">
-  <link rel="stylesheet" href="/static/style.css?v=1.24.71">
-  <link rel="stylesheet" href="/static/css/resource-diagnostics.css?v=1.24.71">
-  <link rel="stylesheet" href="/static/css/background-jobs.css?v=1.24.71">
-  <link rel="stylesheet" href="/static/css/voice-design.css?v=1.24.71">
-  <link rel="stylesheet" href="/static/css/rehearser.css?v=1.24.71">
-  <link rel="stylesheet" href="/static/css/audiobook.css?v=1.24.71">
+  <link rel="stylesheet" href="/static/style.css?v=1.24.72">
+  <link rel="stylesheet" href="/static/css/resource-diagnostics.css?v=1.24.72">
+  <link rel="stylesheet" href="/static/css/background-jobs.css?v=1.24.72">
+  <link rel="stylesheet" href="/static/css/voice-design.css?v=1.24.72">
+  <link rel="stylesheet" href="/static/css/rehearser.css?v=1.24.72">
+  <link rel="stylesheet" href="/static/css/audiobook.css?v=1.24.72">
 
 
   <!-- ── Flag icons — non-blocking (loaded async, icons appear after JS) ── -->
@@ -397,7 +397,7 @@ window.toggleNavTree = function(treeId, chevronId) {
 </script>
 
 <!-- loader.js: fetches sections → loads JS modules → removes skeleton -->
-<script src="/static/loader.js?v=1.24.71"></script>
+<script src="/static/loader.js?v=1.24.72"></script>
 
 </body>
 </html>
diff --git a/static/js/studio.js b/static/js/studio.js
index e8936c1..512be60 100644
--- a/static/js/studio.js
+++ b/static/js/studio.js
@@ -11,6 +11,8 @@
 // the same element ids would collide; physically relocating the existing
 // node (same id, same listeners) does not.
 
+(function (root) {
+
 const STUDIO_RESUME_KEY = 'ttsvc_studio_resume';
 let _stuActive = 1;
 
@@ -595,3 +597,21 @@ function studioOnShow() {
   showStudioPhase(_stuActive);
 }
 window.studioOnShow = studioOnShow;
+
+Object.assign(root, {
+  STUDIO_RESUME_KEY, _stuActive, _stuReadResume, _stuSaveResume, _stuHomes,
+  _stuBorrow, _stuReturnAll, _stuIsActive, _stuAllowNextNav, _STU_BORROWED_FROM,
+  _stuNavGuardInstalled, _stuInstallNavGuardOnce, _stuCallSuppressingNav,
+  _stuEnterPhase, _stuSyncModeToggle, _stuCastView, _stuShowCastView,
+  _stuCastFootObserver, _stuCastFootHealthTimer, _stuCastIsRunning,
+  _stuSyncCastFallbackControls, _stuRelocateCastFoot, _stuTryRelocateCastFoot,
+  _stuRestoreCastFoot, showStudioPhase, studioOnShow,
+});
+root.TTVC = root.TTVC || {};
+root.TTVC.studio = root.TTVC.studio || {};
+Object.assign(root.TTVC.studio, {
+  state: { get activePhase() { return _stuActive; }, get active() { return _stuIsActive; } },
+  showPhase: showStudioPhase,
+  onShow: studioOnShow,
+});
+})(window);