diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 4ec2253..2595f69 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
       - name: Frontend unit tests
         run: node tests/frontend/unit.test.mjs
 
-      - name: Frontend JSDOM tests (PaneManager + Excalidraw + Plugins + AI + SW + Collab + Mobile + Semantic + Desktop)
+      - name: Frontend JSDOM tests (PaneManager + Excalidraw + Plugins + AI + SW + Collab + Mobile + Semantic + Desktop + Inline edition)
         run: |
           cd tests/frontend
           if [ -d node_modules ]; then
@@ -52,6 +52,7 @@ jobs:
             node semantic-search.test.mjs
             node desktop.test.mjs
             node toolbar-order.test.mjs
+            node editor-inline.test.mjs
           else
             echo "tests/frontend/node_modules missing - installing jsdom"
             npm install --no-audit --no-fund --silent
@@ -65,6 +66,7 @@ jobs:
             node semantic-search.test.mjs
             node desktop.test.mjs
             node toolbar-order.test.mjs
+            node editor-inline.test.mjs
           fi
 
   # ── Tests ─────────────────────────────────────────────────────────
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0cfbc1..66434ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -78,6 +78,28 @@ et [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   Tests : `tests/frontend/ai.test.mjs` (82), `tests/test_bookslm.py::TestToolEventSources` (4),
   `tests/test_web_tools.py` (10).
 
+### Modifié
+
+- **#93 Édition inline — « Editer » et « Forge » remplacent la vue lecture** : le conteneur
+  d'édition (`#editor-container`, CodeMirror ou iframe Forge) est déplacé **dans la zone de
+  contenu du document** (`#content-area`, ou le panneau actif en vue fractionnée) au lieu
+  d'être affiché dans l'overlay plein écran : le mode édition **remplace** le document en mode
+  lecture (bandeau, métadonnées, tags et contenu). L'overlay reste monté mais neutralisé
+  (transparent, sans capture des clics, `z-index` conservé) car le ruban d'édition mobile y est
+  ancré. Retour à la lecture par ✓ (sauvegarde), ✕, Échap ou l'ouverture d'un autre fichier —
+  un garde-fou dans `renderFile()` libère proprement la session (destruction CodeMirror/Yjs,
+  retrait de l'iframe Forge) ; l'overlay n'est conservé qu'en repli, quand la cible n'est pas le
+  document affiché (ex. fichier créé depuis la palette). Conséquence directe : l'éditeur ne
+  recouvre plus le panneau de l'assistant IA, qui peut donc mettre le document à jour **sous
+  les yeux de l'utilisateur** — `app_context.editing` annonce au modèle le document en cours
+  d'édition (et sa surface), et toute écriture d'outil (`edit_file`, `append_to_file`,
+  `create_file`, `restore_backup`) recharge le document affiché depuis le disque
+  (`obsigate:file-written`) : le tampon de l'éditeur est rafraîchi au lieu d'écraser la
+  modification de l'assistant par son auto-sauvegarde, et l'iframe Forge reçoit
+  `parent-reload`. Aucun identifiant DOM n'a changé (autosave, collab Yjs, barre IA, aperçu
+  Mermaid, Forge intacts). Fiche : [docs/features/editeur-inline.md](./docs/features/editeur-inline.md).
+  Tests : `tests/frontend/editor-inline.test.mjs` (19), `tests/test_bookslm.py::TestGeneralPrompt` (3 nouveaux).
+
 ### Corrigé
 
 - **#91 — Bulle utilisateur trop étroite & ancre d'envoi retardée** : le plafond de
diff --git a/backend/bookslm.py b/backend/bookslm.py
index 8c5f153..832d09c 100644
--- a/backend/bookslm.py
+++ b/backend/bookslm.py
@@ -529,6 +529,17 @@ def _format_app_context(app_context: dict[str, Any] | None, recent_files: list[d
     if rendered_docs:
         lines.append("- Documents ouverts dans les onglets/panneaux : " + ", ".join(rendered_docs))
 
+    editing = app_context.get("editing")
+    if isinstance(editing, dict) and editing.get("path"):
+        surface = "Forge" if editing.get("surface") == "forge" else "l'éditeur"
+        location = f"{editing['path']} (vault {editing['vault']})" if editing.get("vault") else str(editing["path"])
+        lines.append(
+            f"- Document en cours d'édition dans {surface} : {location} — c'est le document affiché à la "
+            "place de la vue lecture. Pour le mettre à jour, utilise les outils d'écriture "
+            "(`edit_file`, `append_to_file`) : la modification est rechargée automatiquement dans "
+            "l'éditeur et la vue lecture dès l'exécution de l'outil."
+        )
+
     query = app_context.get("search_query")
     if query:
         total = app_context.get("search_total")
diff --git a/docs/ROADMAP.md b/docs/ROADMAP.md
index 622db91..4c44ac0 100644
--- a/docs/ROADMAP.md
+++ b/docs/ROADMAP.md
@@ -1,6 +1,6 @@
 # ObsiGate — Roadmap
 
-> **Version :** 2.3.0-dev | **Dernière mise à jour :** 2026-09-14
+> **Version :** 2.3.0-dev | **Dernière mise à jour :** 2026-09-15
 > **Ce fichier ne contient que le travail à venir** (🔵 En cours + ⚪ Backlog) et un index compact
 > vers les fonctionnalités livrées.
 > - **Méthode de livraison à appliquer pour toute tâche : [DELIVERY_WORKFLOW.md](./DELIVERY_WORKFLOW.md)**
@@ -188,6 +188,7 @@
 | 83 | Barre d'outils d'édition mobile — ruban style Obsidian Android | 2.3.0 | [archive](./archive/COMPLETED_v1-v2.md) |
 | 88 | Assistant IA — contexte applicatif (documents ouverts, répertoire, recherche, fichiers récents) & liens de fichiers fiables (BUG-041, BUG-042) | 2.3.0 | [features/ai-app-context.md](./features/ai-app-context.md) |
 | 91 | Assistant IA — Zone de discussion façon Notion : post ancré en haut, fournisseur/modèle discret & barre d'actions | 2.3.0 | [features/ai-assistant-conversation-ux.md](./features/ai-assistant-conversation-ux.md) |
+| 93 | Édition inline — « Editer » et « Forge » remplacent la vue lecture (assistant IA qui met le document à jour) | 2.3.0 | [features/editeur-inline.md](./features/editeur-inline.md) |
 
 ---
 
@@ -195,7 +196,7 @@
 
 | Priorité | Items | Effort total estimé |
 |---|---|---|
-| ✅ Complété | #1 → #59, #61–72, #74–76, #78–84, #88–91 | ~107 jours réalisés |
+| ✅ Complété | #1 → #59, #61–72, #74–76, #78–84, #88–93 | ~108 jours réalisés |
 | 🔵 P2 restant | #77 Desktop : signature de code (non retenue), 6 tests E2E **manuels** ([protocole](./DESKTOP_E2E_CHECKLIST.md)) | ~0,5-1 jour |
 | ⚪ P4 restant | #73 Sync (6-8j) | 6-8 jours |
 | ⚪ P2 restant | #92 Assistant IA — écosystème d'outils phase 2 (web étendu, sources connectées, documents) | 3-5 jours |
diff --git a/docs/features/editeur-inline.md b/docs/features/editeur-inline.md
new file mode 100644
index 0000000..9ac3815
--- /dev/null
+++ b/docs/features/editeur-inline.md
@@ -0,0 +1,125 @@
+# #93 — Édition inline : « Editer » et « Forge » remplacent la vue lecture
+
+> **Statut :** 🟢 livré (en attente de vérification utilisateur)
+> **Version :** 2.3.0
+> **Composants :** `frontend/js/editor-inline.js` (nouveau), `frontend/js/utils.js`,
+> `frontend/js/viewer.js`, `frontend/js/sync.js`, `frontend/js/bookslm.js`,
+> `frontend/editor-poc.html`, `frontend/index.html`, `frontend/style.css`,
+> `backend/bookslm.py`
+> **Tests :** `tests/frontend/editor-inline.test.mjs` (19),
+> `tests/test_bookslm.py::TestGeneralPrompt` (7)
+
+## Contexte
+
+Le mode édition (bouton **Editer**, CodeMirror) et **Forge** (éditeur avancé dans une iframe)
+s'ouvraient dans `#editor-modal` : un overlay `position: fixed` plein écran. Le document restait
+rendu **dessous**, mais invisible, et l'overlay recouvrait le panneau de l'assistant IA
+(`.bookslm-panel`, `z-index: 100` contre `1000` pour la modale). Conséquences :
+
+- le document n'était plus consultable pendant l'édition (pas de relecture côte à côte) ;
+- l'assistant IA était inutilisable pendant l'édition : son action « Ajouter » (qui insère dans
+  `state.editorView`) exigeait une session d'édition ouverte… que l'utilisateur ne pouvait pas
+  regarder en même temps que l'assistant.
+
+## Conception
+
+### 1. Bascule du conteneur d'édition dans la zone de lecture
+
+`frontend/js/editor-inline.js` (module autonome, sans dépendance) déplace le conteneur
+`#editor-container` — qui contient le CodeMirror **ou** l'iframe Forge — de l'overlay vers la
+zone de contenu :
+
+```
+#content-area (ou .pane-content de la pane active)   ← le document en lecture
+  └── .editor-container.editor-inline                ← l'éditeur, à la place du document
+```
+
+| Fonction | Rôle |
+|---|---|
+| `getEditorContainer()` / `getEditorModal()` | résolution par id (`#editor-container`, `#editor-modal`) |
+| `getInlineHostArea()` | zone de lecture visée : override de rendu, pane active en vue fractionnée, sinon `#content-area` |
+| `isInlineEditorActive()` | une session occupe-t-elle une zone de contenu ? |
+| `mountEditorInline(area)` | `area.replaceChildren(container)` + classes `editor-inline` / `editor-inline-host` / `editor-inline-mode` |
+| `unmountEditorInline()` | conteneur rendu à la modale, zone vidée, renvoie la zone à re-rendre |
+
+Aucun identifiant DOM n'est modifié (`#editor-body`, `#editor-save`, `#editor-title-input`…) :
+CodeMirror, l'auto-sauvegarde (2 s), la collaboration Yjs, la barre IA, l'aperçu Mermaid et
+l'iframe Forge continuent de fonctionner sans réécriture. Seul l'**hôte** change.
+
+L'overlay reste monté et garde la classe `active` (signal d'état utilisé par l'auto-save, le
+raccourci Ctrl+J, la hauteur d'éditeur mobile…), mais passe en classe
+`editor-inline-mode` : transparent, sans fond ni padding, `pointer-events: none` (le ruban
+d'édition mobile `.me-ribbon`, ancré à la modale, conserve `pointer-events: auto`).
+
+### 2. Cycle de vie
+
+| Action | Effet |
+|---|---|
+| **Editer** / **Forge** | `activateInlineEditor(vault, path)` → bascule inline **si** la cible est le document affiché dans la zone de contenu |
+| ✓ (Sauvegarder) | sauvegarde puis `closeEditor()` → retour à la lecture (contenu relu depuis le disque) |
+| ✕ (Annuler) / **Échap** | `closeEditor()` → retour à la lecture (les modifications non sauvegardées sont abandonnées, comme avant) |
+| Ouverture d'un autre fichier (`renderFile()`) | garde-fou : `detachInlineEditor()` libère la session (destroy CodeMirror/Yjs, retrait de l'iframe Forge) avant le rendu de la lecture |
+| `forge-close` (message de l'iframe) | route vers `closeEditor()` — plus de manipulation manuelle de la modale dans `sync.js` |
+
+**Repli overlay** : si la cible n'est pas le document affiché (fichier venant d'être créé via la
+palette, par exemple), la modale plein écran est conservée. Le mode inline exige que la zone de
+lecture soit celle du fichier édité — c'est ce qui garantit que « remplacer » signifie bien
+remplacer *ce* document.
+
+L'invalidation du cache d'onglet (`_invalidateActiveTabCache`) évite qu'un aller-retour
+d'onglets réaffiche le HTML **d'avant** l'édition.
+
+### 3. Assistant IA — document mis à jour sous les yeux de l'utilisateur
+
+L'éditeur n'occupe plus le panneau de l'assistant : les deux surfaces cohabitent. Trois
+ajouts rendent la mise à jour effective de bout en bout :
+
+1. **`app_context.editing`** — `bookslm.js::_editingDocument()` envoie
+   `{vault, path, surface: "editor"|"forge"}` quand une session d'édition est ouverte ;
+   `backend/bookslm.py::_format_app_context()` l'annonce dans le prompt Général
+   (« Document en cours d'édition dans … ») et indique au modèle d'utiliser les outils
+   d'écriture pour le mettre à jour.
+2. **`obsigate:file-written`** — à chaque événement SSE `tool` réussi d'un outil d'écriture
+   (`edit_file`, `append_to_file`, `create_file`, `restore_backup`), `bookslm.js` diffuse un
+   événement `{vault, path}`.
+3. **Rechargement** — `utils.js::reloadExternalWrite()` :
+   - fichier ouvert dans l'éditeur inline → le tampon CodeMirror est **remplacé** par le contenu
+     du disque (l'auto-sauvegarde de ce remplacement est neutralisée, sinon elle réécrivait
+     l'ancien texte par-dessus la modification de l'IA) ;
+   - fichier ouvert dans Forge → message `parent-reload` à l'iframe (`editor-poc.html`), qui
+     relit le fichier et abandonne son tampon périmé ;
+   - fichier simplement affiché en lecture → re-rendu depuis le disque.
+
+Sans ce point 3, une édition par l'IA aurait été silencieusement écrasée par l'auto-sauvegarde de
+l'éditeur deux secondes plus tard.
+
+### 4. Feuille de style
+
+`frontend/style.css` : `.content-area.editor-inline-host` devient une colonne flex sans padding,
+et `.editor-container.editor-inline` la remplit (`flex: 1`, `height: auto` — pour battre le
+`height: 100vh` de la media query mobile par spécificité, `max-width/max-height: none`, sans
+bordure ni ombre). L'en-tête d'édition (titre, nom de fichier, pastille d'état, ✓/✕/🗑) sert
+donc de barre d'outils du document, et le corps occupe la zone de lecture.
+
+## Limites connues
+
+- Les outils de **renommage / déplacement** de l'IA (`rename_file`, `move_path`) ne déclenchent
+  pas de rechargement : après un renommage, le document redevient accessible via l'arborescence.
+- La collaboration Yjs reste liée à l'ouverture de l'éditeur : un changement d'onglet pendant
+  une session collaborative la termine (comportement identique à celui de la fermeture).
+- Le mode inline suppose un document affiché correspondant à la cible ; les flux « création de
+  fichier » passent donc toujours par la modale.
+
+## Vérification
+
+```bash
+node tests/frontend/editor-inline.test.mjs      # 19 tests (DOM + câblage)
+node tests/frontend/validate-imports.mjs
+node tests/frontend/unit.test.mjs
+.venv/Scripts/python.exe -m pytest tests/test_bookslm.py -k GeneralPrompt
+```
+
+Contrôle manuel sur l'instance de test (`http://localhost:2020`, `admin` / `test123`) : ouvrir un
+document markdown → **Editer** (le document est remplacé par l'éditeur, bandeau/onglets toujours
+visibles, panneau assistant cliquable) → **Forge** depuis la lecture (iframe plein cadre) →
+✓ / ✕ / Échap → retour en lecture avec le contenu à jour.
diff --git a/frontend/editor-poc.html b/frontend/editor-poc.html
index 18d7e53..54647c7 100644
--- a/frontend/editor-poc.html
+++ b/frontend/editor-poc.html
@@ -1450,6 +1450,16 @@ body { font-family: var(--sans); background: var(--bg); color: var(--text); heig
   window.addEventListener('message', function(e) {
     if (!e.data || !e.data.type) return;
     if (e.data.type === 'parent-save') { forceSave(); }
+    // #93 — the parent reloads the document after an external write (AI
+    // assistant edit_file / append_to_file / create_file): re-read from disk
+    // and drop the stale local buffer that would otherwise be autosaved back
+    // over the assistant's change.
+    if (e.data.type === 'parent-reload') {
+      clearTimeout(saveTimer);
+      isDirty = false;
+      loadFile();
+      updateSaveDot();
+    }
     if (e.data.type === 'parent-delete') {
       if (!fileVault || !filePath) return;
       if (!confirm('Supprimer definitivement ' + filePath + ' ?')) return;
diff --git a/frontend/index.html b/frontend/index.html
index 2636ad6..018b2a6 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1211,7 +1211,13 @@
                                                 apercu rapide. Cliquez sur
                                                 <strong>Forge</strong> dans la
                                                 barre d'outils pour l'editeur
-                                                avance.</span
+                                                avance. <strong>Editer</strong> et
+                                                <strong>Forge</strong> remplacent
+                                                le document en mode lecture
+                                                (retour par ✓, ✕ ou
+                                                <strong>Echap</strong>) : le
+                                                panneau de l'assistant IA reste
+                                                accessible a cote.</span
                                             >
                                         </div>
                                     </div>
@@ -1370,9 +1376,11 @@
             </div>
         </div>
 
-        <!-- Editor Modal -->
+        <!-- Editor Modal — the .editor-container is moved into the document
+             content area (inline mode, #93) when a file is being edited, so the
+             editor replaces the read view instead of overlaying it. -->
         <div class="editor-modal" id="editor-modal">
-            <div class="editor-container">
+            <div class="editor-container" id="editor-container">
                 <div class="editor-header">
                     <span class="editor-brand" data-i18n="header.logo">ObsiGate</span>
                     <input
diff --git a/frontend/js/bookslm.js b/frontend/js/bookslm.js
index 1ae74a2..9d88e39 100644
--- a/frontend/js/bookslm.js
+++ b/frontend/js/bookslm.js
@@ -781,6 +781,12 @@ class BooksLM {
         ctx.open_documents = docs.map((d) => ({ vault: d.vault, path: d.path }));
       }
 
+      // #93 — Live edition session: the document currently replaced by the
+      // editor/Forge surface. Knowing it lets the assistant target "le document
+      // que je suis en train d'éditer" and update it in place.
+      const editing = this._editingDocument();
+      if (editing) ctx.editing = editing;
+
       const query = state.advancedSearchLastQuery;
       if (query) {
         ctx.search_query = query;
@@ -803,6 +809,43 @@ class BooksLM {
     return ctx;
   }
 
+  /**
+   * #93 — The document currently being edited, i.e. the one the editor/Forge
+   * surface replaced the read view with, or null. Sent as `app_context.editing`
+   * so the assistant can target "le document que je suis en train d'éditer".
+   */
+  _editingDocument() {
+    try {
+      const modal = document.getElementById('editor-modal');
+      if (!modal || !modal.classList.contains('active')) return null;
+      const vault = state.editorVault;
+      const path = state.editorPath;
+      if (!vault || !path) return null;
+      return { vault, path, surface: document.getElementById('forge-iframe') ? 'forge' : 'editor' };
+    } catch (e) {
+      return null;
+    }
+  }
+
+  /**
+   * #93 — A write tool just modified a vault file. Notify the UI so the
+   * displayed document is reloaded from disk: otherwise the read view keeps the
+   * stale content, and an open editor buffer autosaves the old text back over
+   * the assistant's change (see utils.reloadExternalWrite).
+   */
+  _notifyFileWritten(data) {
+    if (!data || data.ok === false) return;
+    const WRITE_TOOLS = ['edit_file', 'append_to_file', 'create_file', 'restore_backup'];
+    if (WRITE_TOOLS.indexOf(data.name) === -1) return;
+    const args = data.arguments || {};
+    if (!args.vault || !args.path) return;
+    window.dispatchEvent(
+      new CustomEvent('obsigate:file-written', {
+        detail: { vault: args.vault, path: args.path, tool: data.name },
+      }),
+    );
+  }
+
   // ── Rendering ───────────────────────────────────────────────────────
 
   _render() {
@@ -2575,6 +2618,8 @@ class BooksLM {
           step: data.step || null,
           sources: Array.isArray(data.sources) ? data.sources : [],
         });
+        // #93 — a vault write must be reflected in the displayed document.
+        this._notifyFileWritten(data);
         this._setActivity('working', t('ai.activity_tool', { name: data.name }));
         return;
       }
diff --git a/frontend/js/editor-inline.js b/frontend/js/editor-inline.js
new file mode 100644
index 0000000..7e5678f
--- /dev/null
+++ b/frontend/js/editor-inline.js
@@ -0,0 +1,115 @@
+/**
+ * ObsiGate — Inline editor host (ROADMAP #93)
+ *
+ * The edition surface (`#editor-container`, containing the CodeMirror editor or
+ * the Forge iframe) used to live inside the full-screen `#editor-modal` overlay,
+ * which covered both the document read view and the AI assistant sidebar.
+ *
+ * This module moves that container **into the content area of the document
+ * being read** so editing replaces the read view instead of overlaying it:
+ *
+ *   `#content-area` (or the active pane `.pane-content` in split view)
+ *     └── .editor-container.editor-inline   ← the editor, replacing the document
+ *
+ * Keeping the same DOM nodes (same ids: `#editor-body`, `#editor-save`, …) means
+ * CodeMirror, autosave, Yjs collaboration, the AI toolbar and the Forge iframe
+ * keep working untouched — only their host moves.
+ *
+ * Classes:
+ *   `.editor-inline`       — set on the container while it hosts an inline session
+ *   `.editor-inline-host`  — set on the content area it replaces
+ *   `#editor-modal.editor-inline-mode` — the overlay is neutralised (transparent,
+ *                          zero-size, no scroll) but keeps `active`, so the mobile
+ *                          ribbon anchored to it (`.me-ribbon`) still works.
+ */
+
+export const INLINE_CONTAINER_CLASS = 'editor-inline';
+export const INLINE_HOST_CLASS = 'editor-inline-host';
+export const INLINE_MODAL_CLASS = 'editor-inline-mode';
+
+/** The editor overlay element (`#editor-modal` when present). */
+export function getEditorModal() {
+  return document.getElementById('editor-modal');
+}
+
+/**
+ * The editor container, wherever it currently lives (modal or content area).
+ * Falls back to a class lookup so the helper also works on a DOM where the id
+ * was not set (tests, older markup).
+ */
+export function getEditorContainer() {
+  return (
+    document.getElementById('editor-container') ||
+    document.querySelector('.editor-container.' + INLINE_CONTAINER_CLASS)
+  );
+}
+
+/**
+ * Content area that should host the inline editor: the pane currently being
+ * read. Mirrors viewer.js `getContentArea()` (multi-pane aware).
+ */
+export function getInlineHostArea() {
+  if (typeof window !== 'undefined') {
+    if (window._activePaneContentArea) return window._activePaneContentArea;
+    if (
+      window.PaneManager &&
+      typeof window.PaneManager.isSplit === 'function' &&
+      window.PaneManager.isSplit() &&
+      typeof window.getActiveContentArea === 'function'
+    ) {
+      return window.getActiveContentArea();
+    }
+  }
+  return document.getElementById('content-area');
+}
+
+/** True when an inline edition session currently owns a content area. */
+export function isInlineEditorActive() {
+  const container = getEditorContainer();
+  return !!(container && container.classList.contains(INLINE_CONTAINER_CLASS));
+}
+
+/**
+ * Move the editor container into `area`, replacing the rendered document.
+ * @returns {boolean} true when the container was mounted inline.
+ */
+export function mountEditorInline(area) {
+  const container = getEditorContainer();
+  const modal = getEditorModal();
+  if (!container || !modal || !area) return false;
+  // Already hosted by this very area — nothing to move.
+  if (container.parentElement === area) {
+    container.classList.add(INLINE_CONTAINER_CLASS);
+    area.classList.add(INLINE_HOST_CLASS);
+    modal.classList.add(INLINE_MODAL_CLASS);
+    return true;
+  }
+  area.classList.add(INLINE_HOST_CLASS);
+  area.replaceChildren(container);
+  container.classList.add(INLINE_CONTAINER_CLASS);
+  modal.classList.add(INLINE_MODAL_CLASS);
+  return true;
+}
+
+/**
+ * Move the editor container back into the modal and clear the inline classes.
+ * The host area is emptied (its read view is gone) and returned so the caller
+ * can re-render the document.
+ * @returns {HTMLElement|null} the content area that must be re-rendered.
+ */
+export function unmountEditorInline() {
+  const container = getEditorContainer();
+  const modal = getEditorModal();
+  if (!container || !modal) return null;
+  const parent = container.parentElement;
+  const host = parent && parent !== modal ? parent : null;
+  container.classList.remove(INLINE_CONTAINER_CLASS);
+  if (host) {
+    host.classList.remove(INLINE_HOST_CLASS);
+    if (typeof host.replaceChildren === 'function') host.replaceChildren();
+    else host.innerHTML = '';
+  }
+  modal.classList.remove(INLINE_MODAL_CLASS);
+  modal.appendChild(container);
+  return host;
+}
diff --git a/frontend/js/sync.js b/frontend/js/sync.js
index 23f232e..c43d594 100644
--- a/frontend/js/sync.js
+++ b/frontend/js/sync.js
@@ -6,6 +6,7 @@ import { api, AuthManager } from './auth.js';
 import { loadVaults, loadTags, refreshTagsForContext, refreshSidebarTreePreservingState } from './sidebar.js';
 import { loadRecentFiles, initAboutModal } from './config.js';
 import { openFile } from './viewer.js';
+import { closeEditor } from './utils.js';
 import { initOffline, syncFileIndexFromServer } from './offline.js';
 import { initThemes } from './themes.js';
 
@@ -636,22 +637,9 @@ export function init() {
       }
     }
     if (e.data.type === 'forge-close') {
-      var modal = document.getElementById('editor-modal');
-      var forgeFrame = document.getElementById('forge-iframe');
-      if (forgeFrame) forgeFrame.remove();
-      if (modal) modal.classList.remove('active');
-      // Restore brand text
-      var brand = modal.querySelector('.editor-brand');
-      if (brand) brand.textContent = 'ObsiGate';
-      // Restore header/footer
-      var headerEl = modal.querySelector('.editor-header');
-      var footerEl = modal.querySelector('.editor-footer');
-      if (headerEl) headerEl.style.display = '';
-      if (footerEl) footerEl.style.display = '';
-      // Refresh current file content
-      if (state.currentVault && state.currentPath) {
-        import('./viewer.js').then(function(m) { m.openFile(state.currentVault, state.currentPath); });
-      }
+      // #93 — shared close path: hands the editor container back to the modal
+      // (inline mode) and re-renders the document read view.
+      closeEditor();
     }
   });
 }
diff --git a/frontend/js/utils.js b/frontend/js/utils.js
index 8ed913a..2f7a85d 100644
--- a/frontend/js/utils.js
+++ b/frontend/js/utils.js
@@ -4,6 +4,67 @@ import { openFile, showWelcome } from './viewer.js';
 import { refreshSidebarForContext, refreshTagsForContext } from './sidebar.js';
 import { createAIToolbar } from './ai.js';
 import { startCollab, stopCollab } from './collab.js';
+import {
+  getInlineHostArea,
+  mountEditorInline,
+  unmountEditorInline,
+  isInlineEditorActive,
+} from './editor-inline.js';
+
+// ---------------------------------------------------------------------------
+// Inline edition (#93)
+// ---------------------------------------------------------------------------
+
+/**
+ * Set just before a programmatic document replacement (external AI write) so
+ * the autosave update listener does not schedule a redundant save of the
+ * freshly reloaded content.
+ */
+let suppressAutoSaveOnce = false;
+
+/**
+ * Inline edition: the editor replaces the document read view in the content
+ * area instead of covering it with the `#editor-modal` overlay. Only possible
+ * when the editor targets the document currently read (the pane area is what
+ * gets taken over); otherwise the overlay is kept as a fallback (e.g. a file
+ * just created from the command palette and not opened in the viewer yet).
+ *
+ * @returns {boolean} true when the editor is hosted inline.
+ */
+export function activateInlineEditor(vaultName, filePath) {
+  if (!vaultName || !filePath) return false;
+  if (state.currentVault !== vaultName || state.currentPath !== filePath) return false;
+  const area = getInlineHostArea();
+  if (!area) return false;
+  return mountEditorInline(area);
+}
+
+/**
+ * Drop an inline edition session without re-rendering the document: used when
+ * the read view is about to be re-rendered for another file (tab switch,
+ * sidebar click, wikilink), which owns the same content area.
+ */
+export function detachInlineEditor() {
+  if (!isInlineEditorActive()) return;
+  const modal = document.getElementById("editor-modal");
+  stopCollab();
+  if (state.editorView) {
+    state.editorView.destroy();
+    state.editorView = null;
+  }
+  state.fallbackEditorEl = null;
+  clearTimeout(window._obsigateAutoSaveTimer);
+  var forgeFrame = document.getElementById("forge-iframe");
+  if (forgeFrame) forgeFrame.remove();
+  if (modal) {
+    modal.classList.remove("active");
+    var brand = modal.querySelector('.editor-brand');
+    if (brand) brand.textContent = 'ObsiGate';
+  }
+  unmountEditorInline();
+  state.editorVault = null;
+  state.editorPath = null;
+}
 
 // ---------------------------------------------------------------------------
 // File extension → Lucide icon mapping
@@ -318,6 +379,11 @@ async function openEditor(vaultName, filePath) {
   if (footerEl) footerEl.style.display = "";
   if (container) container.style.maxHeight = "";
 
+  // #93 — Inline mode: when the edited file is the document currently read, the
+  // editor container takes the place of the read view (no overlay covering the
+  // document and the AI assistant panel).
+  activateInlineEditor(vaultName, filePath);
+
   filenameInput.value = filePath.split("/").pop();
   statFile.textContent = vaultName + "/" + filePath;
 
@@ -361,6 +427,12 @@ async function openEditor(vaultName, filePath) {
       // Auto-save: debounced save after 2s of inactivity
       EditorView.updateListener.of((update) => {
         if (update.docChanged) {
+          // Skip the autosave scheduled by a programmatic reload of the
+          // document (external write by the AI assistant, #93).
+          if (suppressAutoSaveOnce) {
+            suppressAutoSaveOnce = false;
+            return;
+          }
           clearTimeout(window._obsigateAutoSaveTimer);
           window._obsigateAutoSaveTimer = setTimeout(() => saveFile(true), 2000);
           // Mark dirty
@@ -506,26 +578,106 @@ function closeEditor() {
   const vault = state.editorVault;
   const path = state.editorPath;
   const modal = document.getElementById("editor-modal");
+  if (!modal) return;
   modal.classList.remove("active");
   // Restore brand text
   var brand = modal.querySelector('.editor-brand');
   if (brand) brand.textContent = 'ObsiGate';
+  // Restore header/footer (may be hidden by Forge)
+  var headerEl = modal.querySelector(".editor-header");
+  var footerEl = modal.querySelector(".editor-footer");
+  if (headerEl) headerEl.style.display = "";
+  if (footerEl) footerEl.style.display = "";
   stopCollab();
   if (state.editorView) {
     state.editorView.destroy();
     state.editorView = null;
   }
   state.fallbackEditorEl = null;
-  // Remove forge iframe if present + refresh current file
+  clearTimeout(window._obsigateAutoSaveTimer);
+  // Remove forge iframe if present
   var forgeFrame = document.getElementById("forge-iframe");
-  if (forgeFrame) {
-    forgeFrame.remove();
-    if (state.currentVault && state.currentPath) openFile(state.currentVault, state.currentPath);
-  }
+  if (forgeFrame) forgeFrame.remove();
+  // #93 — give the editor container back to the modal; an inline session also
+  // releases the content area, whose read view must be re-rendered.
+  const host = unmountEditorInline();
+  _invalidateActiveTabCache(vault, path);
   state.editorVault = null;
   state.editorPath = null;
-  // Refresh file content if we're viewing the edited file
-  if (vault && path && state.currentVault === vault && state.currentPath === path) {
+  if (host) {
+    const rereadVault = state.currentVault || vault;
+    const rereadPath = state.currentPath || path;
+    if (rereadVault && rereadPath) openFile(rereadVault, rereadPath);
+  } else if (vault && path && state.currentVault === vault && state.currentPath === path) {
+    // Refresh file content if we're viewing the edited file
+    openFile(vault, path);
+  }
+}
+
+/**
+ * Drop the cached render of a file in the active tab/panel so that activating
+ * it again re-fetches it from disk instead of restoring the pre-edit HTML.
+ */
+function _invalidateActiveTabCache(vault, path) {
+  if (!vault || !path) return;
+  try {
+    const split = window.PaneManager && typeof window.PaneManager.isSplit === 'function' && window.PaneManager.isSplit();
+    const tm = split && typeof window.getActiveTabManager === 'function'
+      ? window.getActiveTabManager()
+      : window.TabManager;
+    if (!tm || !tm._tabCache) return;
+    const tab = (tm._tabs || []).find((tb) => tb.vault === vault && tb.path === path);
+    const key = tab ? tab.id : `${vault}::${path}`;
+    if (tm._tabCache[key]) tm._tabCache[key].data = null;
+  } catch (err) {
+    /* best effort — a stale cache only means a stale re-render */
+  }
+}
+
+/**
+ * Reload the displayed document after an external write (AI assistant tool
+ * `edit_file` / `append_to_file` / `create_file`, #93).
+ *
+ * Without it the outcome is wrong in two ways: the read view keeps showing the
+ * pre-write content, and — worse — an open editor holds the old text in memory
+ * and its 2s autosave would overwrite the assistant's change with it.
+ */
+async function reloadExternalWrite(vault, path) {
+  if (!vault || !path) return;
+  const isEdited = state.editorVault === vault && state.editorPath === path;
+  if (isEdited) {
+    // Forge hosts its own buffer inside an iframe: ask it to reload from disk.
+    var forgeFrame = document.getElementById("forge-iframe");
+    if (forgeFrame && forgeFrame.contentWindow) {
+      forgeFrame.contentWindow.postMessage({ type: 'parent-reload' }, '*');
+      return;
+    }
+    if (!state.editorView) return;
+    try {
+      const rawUrl = `/api/file/${encodeURIComponent(vault)}/raw?path=${encodeURIComponent(path)}`;
+      const rawData = await api(rawUrl);
+      const view = state.editorView;
+      if (!view || !view.state) return;
+      const raw = rawData && rawData.raw != null ? rawData.raw : "";
+      if (view.state.doc.toString() === raw) return;
+      clearTimeout(window._obsigateAutoSaveTimer);
+      suppressAutoSaveOnce = true;
+      view.dispatch({
+        changes: { from: 0, to: view.state.doc.length, insert: raw },
+        selection: { anchor: Math.min(view.state.selection.main.anchor, raw.length) },
+      });
+      var sd = document.getElementById("editor-save-dot");
+      var sl = document.getElementById("editor-save-label");
+      if (sd) sd.className = "editor-save-dot ok";
+      if (sl) sl.textContent = "Saved";
+    } catch (err) {
+      console.warn("Inline editor: reload after external write failed", err);
+    }
+    return;
+  }
+  // Not editing: refresh the read view when it shows the written document.
+  if (state.currentVault === vault && state.currentPath === path) {
+    _invalidateActiveTabCache(vault, path);
     openFile(vault, path);
   }
 }
@@ -685,6 +837,14 @@ function initEditor() {
     },
     { passive: false },
   );
+
+  // #93 — The AI assistant wrote to a vault file: reload the displayed
+  // document (inline editor, Forge iframe or read view) so the change is
+  // visible right away and never overwritten by the editor's autosave.
+  window.addEventListener("obsigate:file-written", (e) => {
+    const detail = (e && e.detail) || {};
+    reloadExternalWrite(detail.vault, detail.path);
+  });
 }
 
 /** Copy text to clipboard — works on both HTTP and HTTPS */
@@ -713,4 +873,19 @@ function copyToClipboard(text) {
   }
 }
 
-export { getFileIcon, safeCreateIcons, flushIcons, safeHighlight, escapeHtml, EXT_ICONS, openEditor, closeEditor, saveFile, deleteFile, waitForCodeMirror, initEditor, copyToClipboard };
+export {
+  getFileIcon,
+  safeCreateIcons,
+  flushIcons,
+  safeHighlight,
+  escapeHtml,
+  EXT_ICONS,
+  openEditor,
+  closeEditor,
+  reloadExternalWrite,
+  saveFile,
+  deleteFile,
+  waitForCodeMirror,
+  initEditor,
+  copyToClipboard,
+};
diff --git a/frontend/js/viewer.js b/frontend/js/viewer.js
index b3966e7..69732d2 100644
--- a/frontend/js/viewer.js
+++ b/frontend/js/viewer.js
@@ -1,7 +1,8 @@
 /* ObsiGate — Viewer module */
 import { api, AuthManager } from './auth.js';
 import { state } from './state.js';
-import { escapeHtml, safeCreateIcons, safeHighlight, getFileIcon, openEditor, copyToClipboard } from './utils.js';
+import { escapeHtml, safeCreateIcons, safeHighlight, getFileIcon, openEditor, copyToClipboard, activateInlineEditor, detachInlineEditor } from './utils.js';
+import { isInlineEditorActive } from './editor-inline.js';
 import { TabManager, closeMobileSidebar, ContextMenuManager, RightSidebarManager, showToast, buildFrontmatterCard } from './ui.js';
 import { syncActiveFileTreeItem, searchByTag, TagFilterService, refreshSidebarTreePreservingState, focusPathInSidebar } from './sidebar.js';
 import { AutocompleteDropdown, performAdvancedSearch } from './search.js';
@@ -518,6 +519,11 @@ function applyPrettyHighlight(codeEl, lang, text) {
 }
 
 export function renderFile(data) {
+  // #93 — An inline edition session (#editor-container mounted in the content
+  // area) is destroyed by this very re-render: release it first so the editor
+  // state (CodeMirror view, Forge iframe, Yjs session) is torn down cleanly
+  // instead of being wiped mid-session by a tab switch / sidebar click.
+  if (isInlineEditorActive()) detachInlineEditor();
   const area = getContentArea();
 
   // Handle PDF files — render in iframe with TOC sidebar
@@ -749,11 +755,19 @@ export function renderFile(data) {
   const forgeBtn = el("button", { class: "btn-action btn-forge", title: t("viewer.forge_title") }, [icon("hammer", 14), document.createTextNode("Forge")]);
   forgeBtn.addEventListener("click", () => {
     var modal = document.getElementById("editor-modal");
-    var container = modal.querySelector(".editor-container");
     var bodyEl = document.getElementById("editor-body");
     // Set editor state so parent buttons work
     state.editorVault = data.vault;
     state.editorPath = data.path;
+    // #93 — Forge replaces the document read view when this file is the one
+    // currently displayed; otherwise it falls back to the overlay.
+    var inline = activateInlineEditor(data.vault, data.path);
+    if (!inline) {
+      // A stale inline session (another document) must release the area first.
+      detachInlineEditor();
+      state.editorVault = data.vault;
+      state.editorPath = data.path;
+    }
     // Update header: show "Forge" brand + filename
     var brand = modal.querySelector(".editor-brand");
     var titleInp = document.getElementById("editor-title-input");
@@ -766,7 +780,8 @@ export function renderFile(data) {
     var iframe = document.createElement("iframe");
     iframe.id = "forge-iframe";
     iframe.src = "/editor-poc?vault=" + encodeURIComponent(data.vault) + "&path=" + encodeURIComponent(data.path) + "&_ts=" + Date.now();
-    iframe.style.cssText = "width:100%;height:82vh;border:none;display:block;";
+    // Inline: the iframe fills the content area; overlay: the original 82vh.
+    iframe.style.cssText = "width:100%;height:" + (inline ? "100%" : "82vh") + ";border:none;display:block;";
     bodyEl.appendChild(iframe);
     modal.classList.add("active");
     safeCreateIcons();
diff --git a/frontend/style.css b/frontend/style.css
index 87b0297..a7d43a1 100644
--- a/frontend/style.css
+++ b/frontend/style.css
@@ -2795,6 +2795,47 @@ select {
   overflow: hidden;
   box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
 }
+
+/* --- Inline edition (#93) --------------------------------------------------
+   When a document is being edited, `#editor-container` is moved into the
+   document content area: the editor *replaces* the read view instead of
+   covering it with the overlay, so the AI assistant sidebar stays usable.
+   The overlay itself is neutralised but kept mounted (and `active`) because
+   the mobile editing ribbon (`#me-toolbar`, `.me-ribbon`) is anchored to it. */
+.editor-modal.editor-inline-mode {
+  display: block;
+  background: transparent;
+  padding: 0;
+  pointer-events: none;
+}
+.editor-modal.editor-inline-mode .me-ribbon {
+  pointer-events: auto;
+}
+.content-area.editor-inline-host,
+.pane-content.editor-inline-host {
+  display: flex;
+  flex-direction: column;
+  padding: 0;
+  overflow: hidden;
+}
+.content-area.editor-inline-host .editor-container.editor-inline,
+.pane-content.editor-inline-host .editor-container.editor-inline {
+  flex: 1;
+  height: auto;
+  width: 100%;
+  min-height: 0;
+  max-width: none;
+  max-height: none;
+  border: none;
+  border-radius: 0;
+  box-shadow: none;
+  background: var(--bg-primary);
+}
+.editor-container.editor-inline .editor-body,
+.editor-container.editor-inline .editor-body-cm {
+  flex: 1;
+  min-height: 0;
+}
 .editor-header {
   display: flex;
   align-items: center;
diff --git a/tests/frontend/editor-inline.test.mjs b/tests/frontend/editor-inline.test.mjs
new file mode 100644
index 0000000..50f3086
--- /dev/null
+++ b/tests/frontend/editor-inline.test.mjs
@@ -0,0 +1,289 @@
+#!/usr/bin/env node
+/**
+ * ObsiGate — Inline edition tests (ROADMAP #93).
+ *
+ * « Editer » and « Forge » must replace the document read view instead of
+ * opening an overlay on top of it (`#editor-container` is moved into the
+ * content area, so the AI assistant sidebar stays usable while editing).
+ *
+ * Covers:
+ *   - frontend/js/editor-inline.js  — DOM behaviour (mount/unmount/classes)
+ *   - the wiring of that module in viewer.js / utils.js / sync.js / bookslm.js
+ *     (static checks, like tests/frontend/toolbar-order.test.mjs)
+ *   - the Forge iframe reload hook (frontend/editor-poc.html)
+ *   - the CSS that makes the editor fill the content area (frontend/style.css)
+ *
+ * Usage: node tests/frontend/editor-inline.test.mjs
+ */
+
+import { strict as assert } from "node:assert";
+import { readFileSync } from "node:fs";
+import { JSDOM } from "jsdom";
+import { fileURLToPath, pathToFileURL } from "node:url";
+import path from "node:path";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const REPO_ROOT = path.resolve(__dirname, "..", "..");
+
+const dom = new JSDOM(
+  `<!DOCTYPE html><html><body>
+    <div class="app-container">
+      <div class="content-wrapper">
+        <div class="content-area" id="content-area">
+          <div class="file-header"><div class="file-title">Accueil</div></div>
+          <div class="md-content" id="file-rendered-content"><p>Lecture</p></div>
+        </div>
+      </div>
+    </div>
+    <div class="editor-modal" id="editor-modal">
+      <div class="editor-container" id="editor-container">
+        <div class="editor-header"><span class="editor-brand">ObsiGate</span></div>
+        <div class="editor-body editor-body-cm" id="editor-body"></div>
+        <div class="editor-footer"></div>
+      </div>
+    </div>
+  </body></html>`,
+  { url: "https://example.com/", pretendToBeVisual: true },
+);
+
+const w = dom.window;
+globalThis.window = w;
+globalThis.document = w.document;
+globalThis.HTMLElement = w.HTMLElement;
+globalThis.Element = w.Element;
+globalThis.Node = w.Node;
+
+const mod = await import(
+  pathToFileURL(path.join(REPO_ROOT, "frontend", "js", "editor-inline.js")).href
+);
+const {
+  INLINE_CONTAINER_CLASS,
+  INLINE_HOST_CLASS,
+  INLINE_MODAL_CLASS,
+  getEditorModal,
+  getEditorContainer,
+  getInlineHostArea,
+  isInlineEditorActive,
+  mountEditorInline,
+  unmountEditorInline,
+} = mod;
+
+let testCount = 0;
+let failCount = 0;
+
+function test(name, fn) {
+  testCount++;
+  try {
+    fn();
+    console.log(`  ✓ ${name}`);
+  } catch (err) {
+    failCount++;
+    console.error(`  ✗ ${name}\n    ${err.message}`);
+    process.exitCode = 1;
+  }
+}
+
+const modal = () => document.getElementById("editor-modal");
+const container = () => document.getElementById("editor-container");
+const area = () => document.getElementById("content-area");
+
+function reset() {
+  const c = container();
+  const m = modal();
+  if (c.parentElement !== m) m.appendChild(c);
+  c.classList.remove(INLINE_CONTAINER_CLASS);
+  m.classList.remove(INLINE_MODAL_CLASS);
+  area().classList.remove(INLINE_HOST_CLASS);
+  area().innerHTML = '<div class="md-content" id="file-rendered-content"><p>Lecture</p></div>';
+  delete w._activePaneContentArea;
+  delete w.PaneManager;
+  delete w.getActiveContentArea;
+}
+
+console.log("Inline edition (#93) — editor-inline.js");
+
+test("lookup helpers resolve the container and the host area", () => {
+  reset();
+  assert.equal(getEditorModal(), modal());
+  assert.equal(getEditorContainer(), container());
+  assert.equal(getInlineHostArea(), area());
+  assert.equal(isInlineEditorActive(), false);
+});
+
+test("mount moves the container into the content area and drops the read view", () => {
+  reset();
+  assert.equal(mountEditorInline(area()), true);
+  assert.equal(container().parentElement, area());
+  assert.equal(area().querySelector(".md-content"), null, "read view replaced");
+  assert.ok(container().classList.contains(INLINE_CONTAINER_CLASS));
+  assert.ok(area().classList.contains(INLINE_HOST_CLASS));
+  assert.ok(modal().classList.contains(INLINE_MODAL_CLASS));
+  assert.equal(isInlineEditorActive(), true);
+});
+
+test("mount keeps the overlay mounted so the mobile ribbon keeps working", () => {
+  reset();
+  mountEditorInline(area());
+  assert.ok(modal(), "overlay still in the document");
+  assert.equal(container().closest("#editor-modal"), null, "container left the overlay");
+});
+
+test("mount is idempotent on the same host area", () => {
+  reset();
+  mountEditorInline(area());
+  assert.equal(mountEditorInline(area()), true);
+  assert.equal(area().querySelectorAll(".editor-container").length, 1);
+});
+
+test("mount refuses a missing area", () => {
+  reset();
+  assert.equal(mountEditorInline(null), false);
+  assert.equal(isInlineEditorActive(), false);
+});
+
+test("unmount returns the host area, restores the overlay and clears classes", () => {
+  reset();
+  mountEditorInline(area());
+  const host = unmountEditorInline();
+  assert.equal(host, area());
+  assert.equal(container().parentElement, modal());
+  assert.equal(container().classList.contains(INLINE_CONTAINER_CLASS), false);
+  assert.equal(area().classList.contains(INLINE_HOST_CLASS), false);
+  assert.equal(modal().classList.contains(INLINE_MODAL_CLASS), false);
+  assert.equal(isInlineEditorActive(), false);
+  assert.equal(area().children.length, 0, "host area left empty for the read view re-render");
+});
+
+test("unmount without an inline session is a no-op", () => {
+  reset();
+  assert.equal(unmountEditorInline(), null);
+  assert.equal(container().parentElement, modal());
+});
+
+test("host area follows the active pane in split view", () => {
+  reset();
+  const paneArea = document.createElement("div");
+  paneArea.className = "content-area pane-content";
+  document.body.appendChild(paneArea);
+  w.PaneManager = { isSplit: () => true };
+  w.getActiveContentArea = () => paneArea;
+  assert.equal(getInlineHostArea(), paneArea);
+  // A transient render override (pane-manager _renderFileInPane) wins.
+  w._activePaneContentArea = area();
+  assert.equal(getInlineHostArea(), area());
+  assert.equal(mountEditorInline(paneArea), true);
+  assert.equal(container().parentElement, paneArea);
+  unmountEditorInline();
+  paneArea.remove();
+  reset();
+});
+
+// ── Static wiring checks ───────────────────────────────────────────────────
+
+const read = (...parts) => readFileSync(path.join(REPO_ROOT, ...parts), "utf8");
+
+const viewerSrc = read("frontend", "js", "viewer.js");
+const utilsSrc = read("frontend", "js", "utils.js");
+const syncSrc = read("frontend", "js", "sync.js");
+const bookslmSrc = read("frontend", "js", "bookslm.js");
+const indexSrc = read("frontend", "index.html");
+const cssSrc = read("frontend", "style.css");
+const forgeSrc = read("frontend", "editor-poc.html");
+
+console.log("Inline edition (#93) — wiring");
+
+test("index.html gives the editor container a stable id", () => {
+  assert.match(indexSrc, /<div class="editor-container" id="editor-container">/);
+});
+
+test("viewer.js mounts the editor inline when rendering is taken over", () => {
+  assert.match(viewerSrc, /import \{ isInlineEditorActive \} from '\.\/editor-inline\.js';/);
+  const guard = viewerSrc.match(/export function renderFile\(data\) \{([\s\S]*?)\n  const area = getContentArea\(\);/);
+  assert.ok(guard, "renderFile head not found");
+  assert.match(guard[1], /if \(isInlineEditorActive\(\)\) detachInlineEditor\(\);/);
+});
+
+test("viewer.js Forge button mounts inline and sizes the iframe accordingly", () => {
+  assert.match(viewerSrc, /var inline = activateInlineEditor\(data\.vault, data\.path\);/);
+  assert.match(
+    viewerSrc,
+    /iframe\.style\.cssText = "width:100%;height:" \+ \(inline \? "100%" : "82vh"\) \+ ";border:none;display:block;";/,
+  );
+});
+
+test("utils.js activateInlineEditor only takes over the displayed document", () => {
+  const fn = utilsSrc.match(/export function activateInlineEditor\(([\s\S]*?)\n\}/);
+  assert.ok(fn, "activateInlineEditor not found");
+  assert.match(fn[1], /state\.currentVault !== vaultName \|\| state\.currentPath !== filePath/);
+  assert.match(fn[1], /mountEditorInline\(area\)/);
+});
+
+test("utils.js openEditor mounts inline, closeEditor releases the host area", () => {
+  assert.match(utilsSrc, /activateInlineEditor\(vaultName, filePath\);/);
+  const close = utilsSrc.match(/function closeEditor\(\) \{([\s\S]*?)\n\}/);
+  assert.ok(close, "closeEditor not found");
+  assert.match(close[1], /const host = unmountEditorInline\(\);/);
+  assert.match(close[1], /if \(host\) \{/);
+});
+
+test("utils.js detachInlineEditor tears the session down without re-rendering", () => {
+  const fn = utilsSrc.match(/export function detachInlineEditor\(\) \{([\s\S]*?)\n\}/);
+  assert.ok(fn, "detachInlineEditor not found");
+  assert.match(fn[1], /if \(!isInlineEditorActive\(\)\) return;/);
+  assert.match(fn[1], /state\.editorView\.destroy\(\)/);
+  assert.match(fn[1], /unmountEditorInline\(\)/);
+});
+
+test("utils.js reloads the displayed document after an AI write", () => {
+  const fn = utilsSrc.match(/async function reloadExternalWrite\(vault, path\) \{([\s\S]*?)\n\}/);
+  assert.ok(fn, "reloadExternalWrite not found");
+  assert.match(fn[1], /postMessage\(\{ type: 'parent-reload' \}, '\*'\)/);
+  assert.match(fn[1], /suppressAutoSaveOnce = true;/);
+  assert.match(utilsSrc, /window\.addEventListener\("obsigate:file-written"/);
+  assert.match(utilsSrc, /if \(suppressAutoSaveOnce\) \{/, "autosave skipped on programmatic reload");
+});
+
+test("sync.js forge-close goes through the shared close path", () => {
+  assert.match(syncSrc, /import \{ closeEditor \} from '\.\/utils\.js';/);
+  const handler = syncSrc.match(/if \(e\.data\.type === 'forge-close'\) \{([\s\S]*?)\n    \}/);
+  assert.ok(handler, "forge-close handler not found");
+  assert.match(handler[1], /closeEditor\(\);/);
+});
+
+test("bookslm.js reports the edited document and the assistant writes", () => {
+  assert.match(bookslmSrc, /const editing = this\._editingDocument\(\);/);
+  assert.match(bookslmSrc, /if \(editing\) ctx\.editing = editing;/);
+  assert.match(bookslmSrc, /this\._notifyFileWritten\(data\);/);
+  const notify = bookslmSrc.match(/_notifyFileWritten\(data\) \{([\s\S]*?)\n  \}/);
+  assert.ok(notify, "_notifyFileWritten not found");
+  for (const tool of ["edit_file", "append_to_file", "create_file", "restore_backup"]) {
+    assert.ok(notify[1].includes(`'${tool}'`), `${tool} missing from the write tools`);
+  }
+  assert.match(notify[1], /new CustomEvent\('obsigate:file-written'/);
+});
+
+test("editor-poc.html reloads Forge buffer on parent-reload", () => {
+  assert.match(forgeSrc, /if \(e\.data\.type === 'parent-reload'\) \{/);
+  const handler = forgeSrc.match(/if \(e\.data\.type === 'parent-reload'\) \{([\s\S]*?)\n    \}/);
+  assert.ok(handler, "parent-reload handler not found");
+  assert.match(handler[1], /clearTimeout\(saveTimer\);/);
+  assert.match(handler[1], /loadFile\(\);/);
+});
+
+test("style.css lets the inline editor fill the content area", () => {
+  assert.match(cssSrc, /\.editor-modal\.editor-inline-mode \{/);
+  assert.match(cssSrc, /\.editor-modal\.editor-inline-mode \{[\s\S]*?pointer-events: none;/);
+  assert.match(cssSrc, /\.content-area\.editor-inline-host,[\s\S]*?display: flex;/);
+  const fill = cssSrc.match(/\.content-area\.editor-inline-host \.editor-container\.editor-inline,[\s\S]*?\{([\s\S]*?)\n\}/);
+  assert.ok(fill, "inline container rule not found");
+  assert.match(fill[1], /flex: 1;/);
+  assert.match(fill[1], /height: auto;/, "must win over the mobile 100vh rule");
+  assert.match(fill[1], /max-width: none;/);
+});
+
+console.log(`\n${testCount - failCount}/${testCount} tests passed`);
+if (failCount > 0) {
+  console.error(`${failCount} test(s) failed`);
+  process.exit(1);
+}
diff --git a/tests/frontend/unit.test.mjs b/tests/frontend/unit.test.mjs
index 6a8a701..55e3f96 100644
--- a/tests/frontend/unit.test.mjs
+++ b/tests/frontend/unit.test.mjs
@@ -107,6 +107,7 @@ function testModulesHaveImports() {
     { file: 'i18n.js', reason: 'standalone — globals' },
     { file: 'offline-db.js', reason: 'standalone — IndexedDB' },
     { file: 'pane-manager.js', reason: 'standalone — no deps' },
+    { file: 'editor-inline.js', reason: 'standalone — DOM-only helpers for the inline editor host (#93)' },
     { file: 'themes.js', reason: 'standalone — no deps' },
         { file: 'sidebar_raw.js', reason: 'legacy file — excluded' },
         { file: 'desktop.js', reason: 'standalone — reads window.__TAURI__ global, no imports needed' },
diff --git a/tests/test_bookslm.py b/tests/test_bookslm.py
index c3822b4..9c63abf 100644
--- a/tests/test_bookslm.py
+++ b/tests/test_bookslm.py
@@ -666,6 +666,45 @@ class TestGeneralPrompt:
         assert "notes/recent.md" in prompt
         assert "auth" in prompt
 
+    def test_general_prompt_includes_edited_document(self):
+        """#93 — the live edition session is announced to the assistant."""
+        from backend.bookslm import build_general_system_prompt
+
+        prompt = build_general_system_prompt(
+            ["Alpha"],
+            app_context={
+                "current_path": "notes/a.md",
+                "editing": {"vault": "Alpha", "path": "notes/a.md", "surface": "editor"},
+            },
+        )
+
+        assert "Document en cours d'édition" in prompt
+        assert "notes/a.md" in prompt
+        assert "edit_file" in prompt
+
+    def test_general_prompt_marks_forge_surface(self):
+        """#93 — Forge (iframe) is distinguished from the CodeMirror editor."""
+        from backend.bookslm import build_general_system_prompt
+
+        prompt = build_general_system_prompt(
+            ["Alpha"],
+            app_context={"editing": {"vault": "Alpha", "path": "notes/a.md", "surface": "forge"}},
+        )
+
+        assert "dans Forge" in prompt
+        assert "Document en cours d'édition" in prompt
+
+    def test_general_prompt_ignores_malformed_editing(self):
+        """#93 — a malformed `editing` payload must not break the prompt."""
+        from backend.bookslm import build_general_system_prompt
+
+        prompt = build_general_system_prompt(
+            ["Alpha"],
+            app_context={"editing": {"vault": "Alpha"}},
+        )
+
+        assert "Document en cours d'édition" not in prompt
+
     def test_general_prompt_without_app_context_is_unchanged(self):
         """No context → no app-context block (backwards compatible)."""
         from backend.bookslm import build_general_system_prompt