docs(auth,devices): Beam WO5 batch 3 — 15 endpoints backfilled, registry pinned

Beam backfilled auth core (login/register/refresh/logout/profile) and devices
core (list/update/delete/shelf CRUD/sidecar/register flow) with frontmatter,
provenance, and labeled examples. All claimed shapes verified against
handlers: AuthResponse {access_token, refresh_token omitempty, token_type,
expires_in, user}, update device {device_updated, device}, shelf wrappers,
DeviceAuthStatusResponse.

Claude registry verification: 15 entries pinned by type (LoginRequest,
RegisterRequest, AuthResponse, RefreshTokenRequest/Response, UserProfile,
DeviceListResponse, DeviceUpdateRequest, AddToShelfRequest, SidecarConfig,
DeviceRegistrationRequest/Response, DeviceAuthStatusRequest/Response).
Removed revoke_device.md — name-only duplicate of delete_device.md (same
DELETE /api/devices/:id route; was the last audit-orphan doc).

Gate catches this round (subtle Go serialization facts, now pinned in docs):
- uuid.UUID arrays never serialize as omitted: register/status response
  ALWAYS carries device_id (all-zeros while pending) despite omitempty
- update device request binds device_name, not name
- register response includes device_id alongside registration_id
- list devices response is a {devices, total} wrapper

docs/developer/api/authentication/register.md

@@ -1,3 +1,11 @@
+---
+method: POST
+path: /api/auth/register
+auth: none
+area: authentication
+---
+<!-- source: internal/handlers/auth.go:153 AuthHandler.Register -->
+
 # Register User
 
 Create a new user account.
@@ -18,7 +26,7 @@ Create a new user account.
 
 ### Example Request
 
-```json
+```json example-request
 {
   "email": "user@example.com",
   "username": "john",
@@ -30,10 +38,9 @@ Create a new user account.
 
 ## Response (201 Created)
 
-```json
+```json example-response
 {
-  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
-  "refresh_token": "d4f5g6h7...",
+  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
   "token_type": "Bearer",
   "expires_in": 604800,
   "user": {
@@ -42,9 +49,7 @@ Create a new user account.
     "username": "john",
     "first_name": "John",
     "last_name": "Doe",
-    "role": "user",
-    "theme": "tokyo-night",
-    "created_at": "2026-01-31T10:00:00Z"
+    "role": "user"
   }
 }
 ```