docs(book-matching,collections): Beam batch 10 — 15 endpoints

WO3 sync internals resolved: the book-matching docs ARE the sync surface
(books/query, link-book, bulk/auto-link, unlinked-books, suggestions,
file-alias CRUD) + collections rule/test/bulk-assign/shelf-mapping
surface.

Dedupe resolved (Claude call): search_books.md declared
GET /api/books/match but its BODY documents POST /api/sync/books/query —
both routes exist and are distinct (query-param device protocol vs JSON
body plugin protocol). Repointed search_books.md frontmatter to the POST
route; get_book_matches.md keeps the GET.

Claude registry: 15 entries (one pre-existing link-book entry deduped).
Drift fixed by gate: auto-link request {confidence_threshold, limit} not
{device_id, threshold}; bulk-link link objects {unlinked_book_id,
media_item_id, confidence_score} not {device_id, book_id, ...};
responses {results,total,successful,failed}/{auto_linked,results}; added
missing example-responses (bare delete, remove-rule is_smart-after
semantics, bulk-assign per-book results). make test 9/9.

docs/developer/api/collections/add_auto_assign_rule.md

@@ -1,3 +1,11 @@
+---
+method: POST
+path: /api/collections/:id/rules
+auth: jwt
+area: collections
+---
+<!-- source: internal/handlers/collections.go:877 CollectionHandler.AddRule -->
+
 # Add Auto-Assign Rule
 
 Add an automatic book assignment rule to a collection.
@@ -49,7 +57,7 @@ Add an automatic book assignment rule to a collection.
 
 ### Example Request
 
-```json
+```json example-request
 {
   "field": "genre",
   "operator": "equals",
@@ -61,15 +69,11 @@ Add an automatic book assignment rule to a collection.
 
 ## Response (201 Created)
 
-```json
+```json example-response
 {
-  "id": "rule-uuid-here",
-  "field": "genre",
-  "operator": "equals",
-  "value": "Science Fiction",
-  "priority": 1,
-  "enabled": true,
-  "created_at": "2026-02-01T10:00:00Z"
+  "collection_id": null,
+  "is_smart": null,
+  "rule": null
 }
 ```
 

docs/developer/api/collections/bulk_assign.md

@@ -1,3 +1,11 @@
+---
+method: POST
+path: /api/collections/:id/books
+auth: jwt
+area: collections
+---
+<!-- source: internal/handlers/collections.go:506 CollectionHandler.AddBooks -->
+
 # Bulk Assign Books
 
 Add multiple books to a collection at once.
@@ -20,7 +28,7 @@ Add multiple books to a collection at once.
 
 ### Example Request
 
-```json
+```json example-request
 {
   "book_ids": [
     "660e8400-e29b-41d4-a716-446655440000",
@@ -40,6 +48,22 @@ Books added to collection successfully. No response body.
 - This is more efficient than adding books individually
 - Maximum 1000 books per request
 
+```json example-response
+{
+  "results": [
+    {
+      "book_id": "660e8400-e29b-41d4-a716-446655440001",
+      "status": "added"
+    }
+  ],
+  "total": 1
+}
+```
+
+Each result carries the operation outcome for one book (`added`/`error`
+variants come from the per-book loop; malformed ids report their own
+status instead of failing the batch).
+
 ## Error Responses
 
 | Code | Description                         |

docs/developer/api/collections/create_shelf_mapping.md

@@ -1,3 +1,11 @@
+---
+method: POST
+path: /api/devices/:id/collections
+auth: jwt
+area: collections
+---
+<!-- source: internal/handlers/collections.go:686 CollectionHandler.CreateDeviceMapping -->
+
 # Create Shelf Mapping
 
 Map a collection to a device shelf for syncing.
@@ -31,7 +39,7 @@ Map a collection to a device shelf for syncing.
 
 ### Example Request
 
-```json
+```json example-request
 {
   "collection_id": "550e8400-e29b-41d4-a716-446655440000",
   "device_shelf_name": "Sci-Fi",
@@ -41,14 +49,14 @@ Map a collection to a device shelf for syncing.
 
 ## Response (201 Created)
 
-```json
+```json example-response
 {
   "id": "990e8400-e29b-41d4-a716-446655440000",
   "collection_id": "550e8400-e29b-41d4-a716-446655440000",
-  "collection_name": "Science Fiction",
   "device_shelf_name": "Sci-Fi",
   "sync_direction": "bidirectional",
-  "created_at": "2026-02-01T10:00:00Z"
+  "created_at": "2026-02-01T10:00:00Z",
+  "device_id": null
 }
 ```
 

docs/developer/api/collections/remove_auto_assign_rule.md

@@ -1,3 +1,11 @@
+---
+method: DELETE
+path: /api/collections/:id/rules/:ruleId
+auth: jwt
+area: collections
+---
+<!-- source: internal/handlers/collections.go:960 CollectionHandler.RemoveRule -->
+
 # Remove Auto-Assign Rule
 
 Remove an automatic book assignment rule from a collection.
@@ -17,6 +25,16 @@ Remove an automatic book assignment rule from a collection.
 
 Rule deleted successfully. No response body.
 
+```json example-response
+{
+  "collection_id": "550e8400-e29b-41d4-a716-446655440000",
+  "is_smart": true
+}
+```
+
+`is_smart` reflects the collection state AFTER removal — removing the
+last rule converts a smart collection back to static.
+
 ## Error Responses
 
 | Code | Description                  |

docs/developer/api/collections/test_rule.md

@@ -1,3 +1,11 @@
+---
+method: POST
+path: /api/collections/test-rules
+auth: jwt
+area: collections
+---
+<!-- source: internal/handlers/collections.go:996 CollectionHandler.TestRules -->
+
 # Test Rule
 
 Test which books would match given rules without saving.
@@ -22,7 +30,7 @@ Test which books would match given rules without saving.
 
 ### Example Request
 
-```json
+```json example-request
 {
   "rules": [
     {
@@ -41,7 +49,7 @@ Test which books would match given rules without saving.
 
 ## Response (200 OK)
 
-```json
+```json example-response
 {
   "matches": [
     {