docs(conflicts,queue): Beam WO5 batch — 13 endpoints backfilled, registry pinned

Beam added frontmatter + provenance + labeled examples to the 7 conflict and
6 queue docs, fixing real field drift on the way (resolve response keys,
bulk result shape, dismiss-all deleted count, queue stats counts).

Claude registry verification found TWO Beam catches of Claude's own draft:
- queue routes use :device_id / :item_id params (registry first draft said :id)
- resolve_conflict DOES take a body (ConflictResolutionRequest) — registry
  first draft said nil
Both fixed; gate then surfaced one real Beam defect: example-request used a
nonexistent "resolution" field in resolve + bulk-resolve (real contract:
winner=<source|manual> with required manual_data for manual; strategy=
most_recent|highest_progress|manual). Fixed in the docs.

Pinned by type: ConflictListResponse, ConflictDetailResponse,
ConflictResolveResponse, BulkResolveRequest/Response, QueueStatsResponse,
ConflictResolutionRequest. dismiss-all deleted is an int count.

docs/developer/api/queue/clear_device_queue.md

@@ -1,3 +1,11 @@
+---
+method: DELETE
+path: /api/queue/devices/:device_id/clear
+auth: jwt
+area: queue
+---
+<!-- source: internal/handlers/queue.go:291 QueueHandler.ClearDeviceQueue -->
+
 # Clear Device Queue
 
 Clear all queue items for a specific device.
@@ -24,9 +32,13 @@ DELETE /api/queue/devices/550e8400-e29b-41d4-a716-446655440000/clear
 Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
 ```
 
-## Response (204 No Content)
+## Response (200 OK)
 
-Device queue cleared successfully.
+```json example-response
+{
+  "message": "queue cleared"
+}
+```
 
 ## Error Responses