diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..ebf0801
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
diff --git a/README.md b/README.md
index 7afdd92..3b1162d 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,28 @@ Monorepo de la suite collaborative BOTSU.
 
 - `apps/client` : client Matrix basé sur Cinny `v4.12.6`
 
+## Structure
+
+- `apps/` : applications déployables
+- `packages/` : bibliothèques partagées BOTSU
+- `docs/` : architecture, décisions et sécurité
+- `infra/` : modèles de déploiement et migrations sans secrets
+- `scripts/` : vérifications reproductibles du dépôt
+
+## Commandes actuelles
+
+```bash
+npm test
+npm run build:client
+npm run typecheck:client
+npm run lint:client
+```
+
+`npm test` vérifie actuellement la structure du monorepo. Le build Cinny est
+vert. Les échecs hérités de `typecheck:client` et `lint:client` sont documentés
+dans `docs/adr/0001-development-isolation.md` et ne doivent pas être masqués.
+Les futurs packages BOTSU auront leurs propres gates vertes dès leur création.
+
 ## Dépôts Git
 
 - `origin` : dépôt privé BOTSU sur `git.botsu.net`
diff --git a/infra/README.md b/infra/README.md
new file mode 100644
index 0000000..f19b9f1
--- /dev/null
+++ b/infra/README.md
@@ -0,0 +1,5 @@
+# Infrastructure
+
+Version-controlled deployment templates, migrations, and canary configuration will live here.
+
+This directory must not contain production secrets, live state, database contents, or unencrypted credentials. Applying infrastructure changes always requires a separate reviewed and reversible operation.
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..093053f
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "@botsu/suite",
+  "version": "0.0.0",
+  "private": true,
+  "description": "BOTSU collaborative suite monorepo",
+  "workspaces": [
+    "apps/*",
+    "packages/*"
+  ],
+  "scripts": {
+    "test": "npm run test:workspace",
+    "test:workspace": "node scripts/verify-workspace.mjs",
+    "build:client": "npm --prefix apps/client run build",
+    "lint:client": "npm --prefix apps/client run lint",
+    "typecheck:client": "npm --prefix apps/client run typecheck"
+  },
+  "engines": {
+    "node": ">=22.0.0"
+  }
+}
diff --git a/packages/README.md b/packages/README.md
new file mode 100644
index 0000000..2a8cf52
--- /dev/null
+++ b/packages/README.md
@@ -0,0 +1,5 @@
+# Shared packages
+
+Reusable BOTSU packages will live here. Planned packages include UI, protocol, identity, presence SDK, and testing utilities.
+
+Each package must provide its own tests and public API. Application-specific behavior remains under `apps/`.
diff --git a/scripts/verify-workspace.mjs b/scripts/verify-workspace.mjs
new file mode 100644
index 0000000..2cfecc6
--- /dev/null
+++ b/scripts/verify-workspace.mjs
@@ -0,0 +1,30 @@
+import assert from 'node:assert/strict';
+import { access, readFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+
+const root = resolve(import.meta.dirname, '..');
+
+const requiredPaths = [
+  '.editorconfig',
+  'package.json',
+  'apps/client/package.json',
+  'docs/adr',
+  'docs/architecture',
+  'infra',
+  'packages',
+];
+
+await Promise.all(requiredPaths.map((path) => access(resolve(root, path))));
+
+const rootPackage = JSON.parse(await readFile(resolve(root, 'package.json'), 'utf8'));
+const clientPackage = JSON.parse(
+  await readFile(resolve(root, 'apps/client/package.json'), 'utf8'),
+);
+
+assert.equal(rootPackage.private, true, 'the monorepo must remain private');
+assert.equal(rootPackage.name, '@botsu/suite');
+assert.deepEqual(rootPackage.workspaces, ['apps/*', 'packages/*']);
+assert.equal(clientPackage.name, 'cinny');
+assert.equal(clientPackage.version, '4.12.6');
+
+console.log('BOTSU workspace structure: OK');