diff --git a/backend/scripts/check-route-auth.js b/backend/scripts/check-route-auth.js
index bfa62ef..4460b88 100644
--- a/backend/scripts/check-route-auth.js
+++ b/backend/scripts/check-route-auth.js
@@ -51,17 +51,29 @@ const GUARDS = [
 ];
 
 // Baseline: number of unprotected :id-routes.
-// Reconciled 2026-06-11: drifted 56→66 via branch merges (lab-content-engine,
-// red-book, exam-prep и др.) — pre-commit hook не запускается на merge, поэтому
-// маршруты пришли без проверки. Это уже смерженный долг, а не новый риск.
-// ONLY decrease this over time — never increase it (кроме сверки с уже смерженным).
-const BASELINE = 66;
+// 2026-06-11: линтер научился видеть router-level guards (router.use(<guard>)),
+// что убрало ложные срабатывания (admin/permissions/flashcards/… защищены на
+// уровне роутера). Оставшиеся 8 публичных маршрутов (guest-доска по токену,
+// справочные данные red-book, список тем) помечены @public-by-design. Долг закрыт.
+// ONLY decrease this over time — never increase it.
+const BASELINE = 0;
 
 function scanFile(filePath) {
   const content = fs.readFileSync(filePath, 'utf8');
   const lines   = content.split('\n');
   const issues  = [];
 
+  // Router-level guard: `router.use(<guard>)` without a leading path string
+  // protects every route declared after it (same guards accepted inline).
+  // Find the earliest such line so those routes aren't false-flagged.
+  let globalGuardLine = Infinity;
+  for (let i = 0; i < lines.length; i++) {
+    const t = lines[i].trim();
+    if (!t.startsWith('router.use(')) continue;
+    if (/^router\.use\(\s*['"`]/.test(t)) continue; // path-scoped — not global
+    if (GUARDS.some(g => t.includes(g))) { globalGuardLine = i; break; }
+  }
+
   for (let i = 0; i < lines.length; i++) {
     const line = lines[i].trim();
 
@@ -74,6 +86,9 @@ function scanFile(filePath) {
     if (!pathMatch) continue;
     if (!pathMatch[1].includes(':')) continue;
 
+    // Protected by a router-level guard declared earlier in this file
+    if (i > globalGuardLine) continue;
+
     // Collect the full route call (may span multiple lines)
     let callText = line;
     let j = i + 1;
diff --git a/backend/src/routes/guestClassroom.js b/backend/src/routes/guestClassroom.js
index 0a50b63..a88c89e 100644
--- a/backend/src/routes/guestClassroom.js
+++ b/backend/src/routes/guestClassroom.js
@@ -40,6 +40,7 @@ function notifySession(sessionId, data) {
 }
 
 /* ── GET /api/classroom/guest/:token ─── session info (pre-join screen) */
+// @public-by-design: гостевой доступ по секретному токену (read-only доска)
 router.get('/:token', (req, res) => {
   const session = sessionByToken(req.params.token);
   if (!session) return res.status(404).json({ error: 'Ссылка недействительна' });
@@ -58,6 +59,7 @@ router.get('/:token', (req, res) => {
 });
 
 /* ── POST /api/classroom/guest/:token/join ─── choose name, get guestId */
+// @public-by-design: гостевой доступ по секретному токену
 router.post('/:token/join', (req, res) => {
   const session = sessionByToken(req.params.token);
   if (!session) return res.status(404).json({ error: 'Ссылка недействительна' });
@@ -92,6 +94,7 @@ router.post('/:token/join', (req, res) => {
 });
 
 /* ── GET /api/classroom/guest/:token/strokes ─── whiteboard strokes */
+// @public-by-design: гостевой доступ по секретному токену
 router.get('/:token/strokes', (req, res) => {
   const session = sessionByToken(req.params.token);
   if (!session) return res.status(404).json({ error: 'Ссылка недействительна' });
@@ -118,6 +121,7 @@ router.get('/:token/strokes', (req, res) => {
 });
 
 /* ── GET /api/classroom/guest/:token/stream ─── SSE */
+// @public-by-design: гостевой доступ по секретному токену (SSE)
 router.get('/:token/stream', (req, res) => {
   const session = sessionByToken(req.params.token);
   if (!session) return res.status(404).end();
@@ -150,6 +154,7 @@ router.get('/:token/stream', (req, res) => {
 });
 
 /* ── POST /api/classroom/guest/:token/leave ─── explicit goodbye */
+// @public-by-design: гостевой доступ по секретному токену
 router.post('/:token/leave', (req, res) => {
   const guestId = req.body?.guestId;
   const guest   = guestId ? guests.get(guestId) : null;
diff --git a/backend/src/routes/red-book.js b/backend/src/routes/red-book.js
index 39aab3a..d63b573 100644
--- a/backend/src/routes/red-book.js
+++ b/backend/src/routes/red-book.js
@@ -11,7 +11,9 @@ router.get('/map-data',           ctrl.getMapData);
 router.get('/food-web',           ctrl.getFoodWeb);
 router.get('/daily',              optionalAuth, ctrl.getDaily);
 router.get('/species',            optionalAuth, ctrl.getSpecies);
+// @public-by-design: публичные справочные данные о виде (read-only)
 router.get('/species/:id',        optionalAuth, ctrl.getSpeciesById);
+// @public-by-design: публичные справочные данные о биоме (read-only)
 router.get('/biome/:habitatId',   ctrl.getBiomeSpecies);
 
 // Auth required
diff --git a/backend/src/routes/subjects.js b/backend/src/routes/subjects.js
index 0088ace..1de9c20 100644
--- a/backend/src/routes/subjects.js
+++ b/backend/src/routes/subjects.js
@@ -30,6 +30,7 @@ router.patch('/:slug', authMiddleware, requireRole('admin'), (req, res) => {
   res.json(db.prepare('SELECT * FROM subjects WHERE slug = ?').get(req.params.slug));
 });
 
+// @public-by-design: публичный список тем предмета (read-only каталог)
 router.get('/:slug/topics', (req, res) => {
   const subject = db.prepare('SELECT id FROM subjects WHERE slug = ?').get(req.params.slug);
   if (!subject) return res.status(404).json({ error: 'Subject not found' });