diff --git a/README.md b/README.md
index 5663e71..2d2bc47 100644
--- a/README.md
+++ b/README.md
@@ -48,10 +48,11 @@ an internal-only Container App (ADR 13/15: sessions and rate limits only, never
 - Postgres allows public access from any IP (`--public-access 0.0.0.0-255.255.255.255`) rather than
   VNet-integrated private access.
 - Three domains are still mocked client-side, honestly labelled "Simulated" in the UI: tax lots,
-  the admin customer directory/detail/KYC-override, and statement export — S8's `/lots`,
-  `/admin/customers*`, and `/admin/kyc-overrides/<id>` routes don't exist yet
-  (`docs/superpowers/specs/2026-09-05-frontend-completion-design.md` has the full design for
-  closing this).
+  the admin customer directory/detail/KYC-override, and statement export. The backend has since
+  caught up — `/lots`, `/admin/customers*`, `/admin/kyc-overrides/<id>`, and
+  `/statements/<period>/export` are all real, registered, tested routes — the frontend just
+  hasn't been wired to them yet (`docs/superpowers/specs/2026-09-05-frontend-completion-design.md`
+  has the full design for closing this).
 - No real-time SSE push (ADR 20/S12 §6) — every screen refetches on mount instead, the documented
   fallback.
 - No new automated test coverage was added for this pass (explicit scope cut — ship fast, harden
diff --git a/backend/app/controllers/api/auth.py b/backend/app/controllers/api/auth.py
index 962d9d8..4e260df 100644
--- a/backend/app/controllers/api/auth.py
+++ b/backend/app/controllers/api/auth.py
@@ -194,6 +194,7 @@ def session_info() -> Any:
 
 
 @auth_bp.route("/logout", methods=["POST"])
+@limiter.limit("60 per minute")
 def logout() -> Any:
     logout_user()
     flask_session.clear()
diff --git a/backend/app/controllers/api/orders.py b/backend/app/controllers/api/orders.py
index a871791..532f5e5 100644
--- a/backend/app/controllers/api/orders.py
+++ b/backend/app/controllers/api/orders.py
@@ -126,7 +126,9 @@ def _to_order_response(uow: OrdersUnitOfWork, order: Order) -> OrderResponse:
 @orders_bp.route("", methods=["POST"])
 @limiter.limit("30 per minute")
 def create_order() -> Any:
-    if not current_user.is_authenticated or current_user.role != "customer":
+    if not current_user.is_authenticated:
+        raise UnauthenticatedError("Authentication required")
+    if current_user.role != "customer":
         raise ForbiddenError("Only a customer may place an order")
 
     idempotency_key = request.headers.get("Idempotency-Key")
@@ -188,7 +190,9 @@ def create_order() -> Any:
 @orders_bp.route("/<uuid:order_id>/approve", methods=["POST"])
 @limiter.limit("30 per minute")
 def approve_order(order_id: uuid.UUID) -> Any:
-    if not current_user.is_authenticated or current_user.role != "customer":
+    if not current_user.is_authenticated:
+        raise UnauthenticatedError("Authentication required")
+    if current_user.role != "customer":
         raise ForbiddenError("Only the owning customer may approve an order")
 
     customer_id = _resolve_customer_id()
@@ -215,7 +219,7 @@ def approve_order(order_id: uuid.UUID) -> Any:
 @limiter.limit("60 per minute")
 def list_orders() -> Any:
     if not current_user.is_authenticated:
-        raise ForbiddenError("Authentication required")
+        raise UnauthenticatedError("Authentication required")
     if current_user.role not in ("customer", *_STAFF_ROLES):
         raise ForbiddenError(f"role {current_user.role} not authorized for this endpoint")
 
@@ -233,7 +237,7 @@ def list_orders() -> Any:
 @limiter.limit("60 per minute")
 def get_order(order_id: uuid.UUID) -> Any:
     if not current_user.is_authenticated:
-        raise ForbiddenError("Authentication required")
+        raise UnauthenticatedError("Authentication required")
     if current_user.role not in ("customer", *_STAFF_ROLES):
         raise ForbiddenError(f"role {current_user.role} not authorized for this endpoint")
 
diff --git a/backend/app/core/errors.py b/backend/app/core/errors.py
index aa0574e..e1878a9 100644
--- a/backend/app/core/errors.py
+++ b/backend/app/core/errors.py
@@ -76,7 +76,12 @@ class ConflictError(AppError):
 
 
 class RateLimitedError(AppError):
-    """The caller has exceeded a configured rate limit (429)."""
+    """An application-level rate limit (429) -- e.g. `chat.py`'s daily query cap, always raised
+    with its own `code=` override. flask-limiter's own per-route limits (`@limiter.limit(...)`)
+    never reach here: those 429s come from flask-limiter's werkzeug exception instead, caught by
+    the generic `HTTPException` handler in `app/__init__.py`, which derives its own `code` from
+    the exception name (`too_many_requests`) -- so the bare `code` below is never what a
+    flask-limiter throttle actually puts on the wire."""
 
     status = 429
     title = "Too Many Requests"
diff --git a/backend/tests/api/test_orders.py b/backend/tests/api/test_orders.py
index c3b9963..09ecfe6 100644
--- a/backend/tests/api/test_orders.py
+++ b/backend/tests/api/test_orders.py
@@ -452,4 +452,13 @@ def test_get_order_rejects_another_customers_order(
 
 def test_list_orders_with_no_session_is_rejected(api_client: FlaskClient) -> None:
     response = api_client.get("/api/v1/orders")
-    assert response.status_code == 403
+    # 401, not 403: no session is an authentication failure, not an authorization one -- a
+    # frontend that keys "session expired -> re-login" off 401 must actually see it here.
+    assert response.status_code == 401
+    assert response.get_json()["code"] == "unauthenticated"
+
+
+def test_get_order_with_no_session_is_rejected(api_client: FlaskClient) -> None:
+    response = api_client.get(f"/api/v1/orders/{uuid.uuid4()}")
+    assert response.status_code == 401
+    assert response.get_json()["code"] == "unauthenticated"
diff --git a/frontend/src/features/admin-customers/api/adminCustomersApi.js b/frontend/src/features/admin-customers/api/adminCustomersApi.js
index f888c13..26b50cf 100644
--- a/frontend/src/features/admin-customers/api/adminCustomersApi.js
+++ b/frontend/src/features/admin-customers/api/adminCustomersApi.js
@@ -1,4 +1,6 @@
-// MOCK — no backend endpoint exists yet (S8). Replace with a real fetch call once that spec ships.
+// MOCK -- the real backend routes (GET /admin/customers*, POST /admin/kyc-overrides/<id>) exist
+// and are tested (backend/app/controllers/admin/), the frontend just hasn't been wired to them
+// yet. See docs/superpowers/specs/2026-09-05-frontend-completion-design.md.
 import { mockClient } from '../../../services/mockClient.js'
 
 const NAMESPACE = 'admin-customers'
diff --git a/frontend/src/features/lots/api/lotsApi.js b/frontend/src/features/lots/api/lotsApi.js
index 476ffc7..03636bf 100644
--- a/frontend/src/features/lots/api/lotsApi.js
+++ b/frontend/src/features/lots/api/lotsApi.js
@@ -1,4 +1,6 @@
-// MOCK — no backend endpoint exists yet (S5). Replace with a real fetch call once that spec ships.
+// MOCK -- the real backend route (GET /lots) exists and is tested
+// (backend/app/controllers/api/lots.py), the frontend just hasn't been wired to it yet. See
+// docs/superpowers/specs/2026-09-05-frontend-completion-design.md.
 import { mockClient } from '../../../services/mockClient.js'
 
 const NAMESPACE = 'lots'
diff --git a/frontend/src/features/statements/api/statementsApi.js b/frontend/src/features/statements/api/statementsApi.js
index db59ae8..542e630 100644
--- a/frontend/src/features/statements/api/statementsApi.js
+++ b/frontend/src/features/statements/api/statementsApi.js
@@ -1,6 +1,8 @@
 import { apiClient } from '../../../services/apiClient.js'
 
-// `export` isn't wired here yet — no export-as-file endpoint exists (Phase 4 mock domain).
+// `export` isn't wired here yet -- the real backend route (GET /statements/<period>/export)
+// exists and is tested (backend/app/controllers/api/statements.py), the frontend just hasn't
+// been pointed at it. See docs/superpowers/specs/2026-09-05-frontend-completion-design.md.
 export const statementsApi = {
   list: () => apiClient.get('/statements'),
   get: (periodStart, publishWatermark) => {