diff --git a/.github/workflows/sonarqube.yml b/.github/workflows/sonarqube.yml
index b02896d..fe278bc 100644
--- a/.github/workflows/sonarqube.yml
+++ b/.github/workflows/sonarqube.yml
@@ -48,6 +48,9 @@ jobs:
             node --check "$f" || exit 1
           done
 
+      - name: Run frontend collision and manifest checks
+        run: npm run check:frontend
+
       - name: Build the frontend bundle
         run: node scripts/minify.mjs
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eaa44bc..ebff20e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 ## [Unreleased]
 
 ### Changed
+- **CI frontend gate.** The manifest-driven JavaScript syntax and top-level declaration collision check now runs in the
+  SonarQube quality workflow, alongside Python compilation, regressions, and the production bundle build.
+- **Structured request correlation.** API and MCP requests now receive a bounded `X-Request-ID` and emit sanitized
+  method/path/status/duration logs without recording request bodies or secrets.
 - **Audiobook parser extraction.** Dialogue detection, PDF dehyphenation, and shared speaker-heuristic constants now
   live in `audiobook-parse.js`, loaded before the Audiobook casting workflow without changing its legacy API.
 - **Rehearser voice-picker extraction.** Voice preview state and matched voice-choice presentation now live in
diff --git a/TODO.md b/TODO.md
index bc1fe3e..0c145c7 100644
--- a/TODO.md
+++ b/TODO.md
@@ -89,6 +89,10 @@ architecture change: the larger Audiobook/Rehearser/style split.
 - [ ] **L — Modularize the frontend.** The shared manifest, compatibility namespace
   bridge, and section-scoped lazy loading are complete foundations; responsibility-level
   extraction and the Audiobook/Rehearser/style split remain.
+- [x] **M — Add structured logs with request/job IDs.** API/MCP requests now receive sanitized correlation IDs and
+  duration logs; route-specific logs retain provider/job context without request bodies.
+- [x] **L — Add linting and duplicate-function checks.** The manifest-driven frontend syntax/declaration gate now runs
+  locally and in the SonarQube quality workflow alongside the existing Python and bundle checks.
 
 ### P2 — after behavior and safety stabilize
 
diff --git a/VERSION b/VERSION
index 3823fa5..f3d13e4 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.24.27
+1.24.29
diff --git a/server.py b/server.py
index 2896390..83250d9 100644
--- a/server.py
+++ b/server.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 import logging
 import os
 import time
+import uuid
 from logging.handlers import RotatingFileHandler
 from pathlib import Path
 from contextlib import asynccontextmanager
@@ -141,6 +142,54 @@ class MutationRateLimitMiddleware:
 
 app.add_middleware(MutationRateLimitMiddleware)
 
+# ── Request/job correlation logging ──────────────────────────────────────────
+# Keep request diagnostics useful without recording request bodies. Route-level
+# logs add provider/job details where appropriate; this middleware supplies one
+# stable correlation ID and timing envelope for every API/MCP request.
+class RequestCorrelationMiddleware:
+    def __init__(self, app):
+        self.app = app
+
+    async def __call__(self, scope, receive, send):
+        if scope["type"] != "http":
+            await self.app(scope, receive, send)
+            return
+        path = scope.get("path", "")
+        if not (path.startswith("/api/") or path == "/mcp"):
+            await self.app(scope, receive, send)
+            return
+        request_id = next((value.decode("latin-1") for key, value in scope.get("headers", [])
+                           if key.lower() == b"x-request-id"), "")
+        if not request_id or len(request_id) > 80 or any(ord(ch) < 33 or ord(ch) > 126 for ch in request_id):
+            request_id = uuid.uuid4().hex
+        started = time.perf_counter()
+        status = 500
+        sent = False
+
+        async def send_wrapper(message):
+            nonlocal status, sent
+            if message["type"] == "http.response.start":
+                status = int(message.get("status", 500))
+                headers = MutableHeaders(scope=message)
+                headers["X-Request-ID"] = request_id
+            if message["type"] == "http.response.body" and not message.get("more_body", False) and not sent:
+                sent = True
+                elapsed_ms = (time.perf_counter() - started) * 1000
+                logger.info("request id=%s method=%s path=%s status=%s duration_ms=%.1f",
+                            request_id, scope.get("method", ""), path, status, elapsed_ms)
+            await send(message)
+
+        try:
+            await self.app(scope, receive, send_wrapper)
+        except Exception:
+            if not sent:
+                logger.info("request id=%s method=%s path=%s status=500 duration_ms=%.1f",
+                            request_id, scope.get("method", ""), path,
+                            (time.perf_counter() - started) * 1000)
+            raise
+
+app.add_middleware(RequestCorrelationMiddleware)
+
 # ── In-memory log buffer handler ──────────────────────────────────────────────
 
 _buf_handler = _BufferHandler()
diff --git a/static/index.html b/static/index.html
index 1f954fe..895ab2a 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="1.24.27">
+  <meta name="app-version" content="1.24.29">
   <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">
@@ -27,7 +27,7 @@
 
   <!-- ── 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=1.24.27">
+  <link rel="stylesheet" href="/static/style.css?v=1.24.29">
 
 
   <!-- ── Flag icons — non-blocking (loaded async, icons appear after JS) ── -->
@@ -392,7 +392,7 @@ window.toggleNavTree = function(treeId, chevronId) {
 </script>
 
 <!-- loader.js: fetches sections → loads JS modules → removes skeleton -->
-<script src="/static/loader.js?v=1.24.27"></script>
+<script src="/static/loader.js?v=1.24.29"></script>
 
 </body>
 </html>
diff --git a/tests/test_security.py b/tests/test_security.py
index d81bfb5..05c89cb 100644
--- a/tests/test_security.py
+++ b/tests/test_security.py
@@ -12,10 +12,29 @@ from fastapi import HTTPException
 
 from core.validation import _validate_character_record, _validate_http_url, _validated_upload_suffix
 from core.config import _load_settings, _save_settings
-from server import RequestSizeLimitMiddleware
+from server import RequestCorrelationMiddleware, RequestSizeLimitMiddleware
 
 
 class SecurityValidationTests(unittest.TestCase):
+    def test_api_request_correlation_adds_safe_id_header(self):
+        async def endpoint(scope, receive, send):
+            await send({"type": "http.response.start", "status": 204, "headers": []})
+            await send({"type": "http.response.body", "body": b""})
+
+        async def run(request_id):
+            messages = []
+            scope = {"type": "http", "method": "GET", "path": "/api/diagnostics",
+                     "headers": [(b"x-request-id", request_id.encode())]}
+            async def send(message): messages.append(message)
+            await RequestCorrelationMiddleware(endpoint)(scope, lambda: None, send)
+            return dict(messages[0]["headers"])
+
+        headers = asyncio.run(run("test-request-123"))
+        self.assertEqual(headers[b"x-request-id"], b"test-request-123")
+
+        generated = asyncio.run(run("bad\nrequest"))
+        self.assertRegex(generated[b"x-request-id"].decode(), r"^[0-9a-f]{32}$")
+
     def test_character_record_rejects_missing_id_and_bad_sheet(self):
         for record in (
             {"name": "Missing id", "sheet": {}},