diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56c5f2c..61bc77e 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
+- **Stateful Audiobook namespace migration.** Casting/recast orchestration and preview/export now keep internal helpers
+ private and publish their public compatibility surface explicitly through `window.TTVC.audiobook`.
- **Pure leaf namespace migration.** Rehearser parsing/training and Audiobook parsing/segmentation helpers now keep
declarations private and publish explicit compatibility exports alongside their `window.TTVC` APIs.
- **P1 architecture audit.** Marked the incremental frontend modularization complete: all planned Audiobook/Rehearser
diff --git a/VERSION b/VERSION
index df64b95..a06c28e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.24.57
+1.24.58
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index 5e238d2..344b028 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -48,6 +48,7 @@ Done incrementally as global-scope ordered files (no ES-module change needed)
- ✅ `audiobook-cast.js` — cast Markdown export, legacy page-stamping migration, deterministic speaker/sentence/duplicate/alias normalization helpers, and the live cast-view renderer.
- ✅ `audiobook-pipeline.js` — LLM casting, unknown-speaker recast, automatic repair, and cast-view orchestration.
- ✅ `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.
- ✅ `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 689ad4c..44f5d90 100644
--- a/static/index.html
+++ b/static/index.html
@@ -10,7 +10,7 @@
-
+
@@ -27,12 +27,12 @@
-
-
-
-
-
-
+
+
+
+
+
+
@@ -397,7 +397,7 @@ window.toggleNavTree = function(treeId, chevronId) {
-
+