docs(kobo,koreader,collections): Beam WO5 batch 6 — 12 endpoints

Kobo emulation + KOReader calibre-compatible surface backfilled with
device-token auth; collections reorder + update_rule created.

Claude registry: 12 entries. kobo/koreader emulation endpoints all bind
arbitrary protocol POST bodies (markup/bookmark/gettests/sync-from-server,
koreader progress/bookmarks) — registered as AnyJSONObject, not bodyless as
first drafted. Initialization returns the library sync payload, not the init
response.

Contract correction in update_rule.md: the route is SetRuleEnabled ({enabled}
required -> {collection_id, is_smart}); Beam's draft invented rule-field
updates. Reordered response/status: {item_ids} -> {status: reordered}.

make test 9/9.

docs/developer/api/koreader/sync_progress.md

@@ -1,3 +1,11 @@
+---
+method: POST
+path: /api/sync/koreader/progress
+auth: device-token
+area: koreader
+---
+<!-- source: internal/handlers/koreader.go:418 KOReaderHandler.SyncProgress -->
+
 # Sync Progress
 
 Push reading progress from a KOReader device.
@@ -42,7 +50,7 @@ Authorization: Bearer {device_token}
 Content-Type: application/json
 ```
 
-```json
+```json example-request
 {
   "books": [
     {
@@ -67,11 +75,12 @@ Content-Type: application/json
 
 ## Response (202 Accepted)
 
-```json
+```json example-response
 {
   "sync_status": "ok",
   "books_synced": 1,
-  "timestamp": "2026-09-26T21:25:09Z"
+  "timestamp": "2026-09-26T21:25:09Z",
+  "device_updated": null
 }
 ```