diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad21316..a2a060e 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
+- **Rehearser I/O namespace migration.** Serialization, library persistence, import/export, and PDF helpers now use a
+  private implementation scope with explicit compatibility exports and the existing namespace API.
 - **Rehearser playback namespace migration.** WebAudio transport, decoded-buffer caching, line-audio caching, and batch
   synthesis now use a private implementation scope with explicit compatibility exports and a tested namespace API.
 - **Stateful Audiobook namespace migration.** Casting/recast orchestration and preview/export now keep internal helpers
diff --git a/VERSION b/VERSION
index 74eb4d2..c69cdff 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.24.59
+1.24.60
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index 7b94c94..c1e4ee7 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -50,6 +50,7 @@ Done incrementally as global-scope ordered files (no ES-module change needed) 
 - ✅ `audiobook-preview-export.js` — editable cast preview, Rehearser handoff, chapter-aware export, and export browsing.
 - ✅ Stateful Audiobook modules use private scopes with explicit legacy exports; their public APIs are namespace-tested.
 - ✅ Rehearser playback uses a private scope with explicit transport/cache compatibility exports and a namespace-tested API.
+- ✅ Rehearser I/O uses a private scope with explicit serialization/library/import 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 e58b2cd..22f12f6 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="1.24.59">
+  <meta name="app-version" content="1.24.60">
   <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=1.24.59">
-  <link rel="stylesheet" href="/static/css/resource-diagnostics.css?v=1.24.59">
-  <link rel="stylesheet" href="/static/css/background-jobs.css?v=1.24.59">
-  <link rel="stylesheet" href="/static/css/voice-design.css?v=1.24.59">
-  <link rel="stylesheet" href="/static/css/rehearser.css?v=1.24.59">
-  <link rel="stylesheet" href="/static/css/audiobook.css?v=1.24.59">
+  <link rel="stylesheet" href="/static/style.css?v=1.24.60">
+  <link rel="stylesheet" href="/static/css/resource-diagnostics.css?v=1.24.60">
+  <link rel="stylesheet" href="/static/css/background-jobs.css?v=1.24.60">
+  <link rel="stylesheet" href="/static/css/voice-design.css?v=1.24.60">
+  <link rel="stylesheet" href="/static/css/rehearser.css?v=1.24.60">
+  <link rel="stylesheet" href="/static/css/audiobook.css?v=1.24.60">
 
 
   <!-- ── 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=1.24.59"></script>
+<script src="/static/loader.js?v=1.24.60"></script>
 
 </body>
 </html>
diff --git a/static/js/rehearser-io.js b/static/js/rehearser-io.js
index 25bf77e..fd8e7b0 100644
--- a/static/js/rehearser-io.js
+++ b/static/js/rehearser-io.js
@@ -1,6 +1,8 @@
 // Rehearser serialization, library I/O, and import/export helpers.
 // Loaded before rehearser.js; dependencies resolve when user actions invoke them.
 
+(function (root) {
+
 // ── Serialization ─────────────────────────────────────────────────────────
 
 async function clipsToJson(clips) {
@@ -442,9 +444,29 @@ function loadRecord(rec) {
 }
 
 
-window.TTVC=window.TTVC||{};
-window.TTVC.rehearser=window.TTVC.rehearser||{};
-Object.assign(window.TTVC.rehearser,{
+// Preserve the classic-script surface for existing handlers while keeping I/O
+// implementation details private to this module.
+Object.assign(root, {
+  clipsToJson,
+  clipsFromJson,
+  rehCurrentRecord,
+  linesToScriptText,
+  saveToLibrary,
+  rehAutoSaveImport,
+  exportToFile,
+  exportFountain,
+  exportFDX,
+  importFDX,
+  exportOSF,
+  loadPdfJs,
+  importPDFScript,
+  importFromFile,
+  loadRecord,
+});
+
+root.TTVC=root.TTVC||{};
+root.TTVC.rehearser=root.TTVC.rehearser||{};
+Object.assign(root.TTVC.rehearser,{
   io:{
     currentRecord:rehCurrentRecord,
     save:saveToLibrary,
@@ -454,4 +476,4 @@ Object.assign(window.TTVC.rehearser,{
     loadRecord,
   },
 });
-
+})(window);