fix(uts): route objects integration clients to the nonprod sandbox

The Realtime client option blocks in objects_lifecycle_test.md (10) and
objects_sync_test.md (5) set no host, so the SDK falls back to the production
endpoint (realtime.ably.io, REC1a) — meaning the clients never reach the nonprod
sandbox the "Sandbox Setup" provisions the app on. Every other UTS integration
spec (realtime + rest) configures clients with endpoint: "nonprod:sandbox"; add
it here to match so the tests actually exercise the sandbox.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: sacOO7

uts/objects/integration/objects_lifecycle_test.md

@@ -54,8 +54,8 @@ propagates via the server and a second client sees the updated value.
 ```pseudo
 channel_name = "objects-lifecycle-" + random_id()
 
-client_a = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
-client_b = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client_a = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
+client_b = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 
 client_a.connect()
 AWAIT_STATE client_a.connection.state == CONNECTED
@@ -105,8 +105,8 @@ on the server. Second client syncs and reads the counter value.
 ```pseudo
 channel_name = "objects-counter-create-" + random_id()
 
-client_a = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
-client_b = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client_a = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
+client_b = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 
 client_a.connect()
 AWAIT_STATE client_a.connection.state == CONNECTED
@@ -152,8 +152,8 @@ The server applies the increment and propagates the updated value.
 ```pseudo
 channel_name = "objects-increment-" + random_id()
 
-client_a = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
-client_b = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client_a = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
+client_b = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 
 client_a.connect()
 AWAIT_STATE client_a.connection.state == CONNECTED
@@ -204,8 +204,8 @@ Second client can navigate into the nested map.
 ```pseudo
 channel_name = "objects-map-create-" + random_id()
 
-client_a = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
-client_b = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client_a = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
+client_b = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 
 client_a.connect()
 AWAIT_STATE client_a.connection.state == CONNECTED
@@ -254,7 +254,7 @@ after the sync sequence completes.
 ```pseudo
 channel_name = "objects-get-root-" + random_id()
 
-client = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 client.connect()
 AWAIT_STATE client.connection.state == CONNECTED
 
@@ -302,7 +302,7 @@ provision_objects_via_rest(api_key, channel_name, [
 
 ### Test Steps
 ```pseudo
-client = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 client.connect()
 AWAIT_STATE client.connection.state == CONNECTED
 

uts/objects/integration/objects_sync_test.md

@@ -54,7 +54,7 @@ processes OBJECT_SYNC messages, then transitions to SYNCED. get() waits for SYNC
 ```pseudo
 channel_name = "objects-sync-" + random_id()
 
-client = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 client.connect()
 AWAIT_STATE client.connection.state == CONNECTED
 
@@ -89,8 +89,8 @@ client.close()
 ```pseudo
 channel_name = "objects-two-sync-" + random_id()
 
-client_a = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
-client_b = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client_a = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
+client_b = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 
 client_a.connect()
 AWAIT_STATE client_a.connection.state == CONNECTED
@@ -137,7 +137,7 @@ is re-populated from the server.
 ```pseudo
 channel_name = "objects-reattach-" + random_id()
 
-client = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 client.connect()
 AWAIT_STATE client.connection.state == CONNECTED
 
@@ -183,7 +183,7 @@ sends HAS_OBJECTS, sync completes, root is an empty LiveMap.
 ```pseudo
 channel_name = "objects-subscribe-only-" + random_id()
 
-client = Realtime(options: { key: api_key, useBinaryProtocol: PROTOCOL == "msgpack" })
+client = Realtime(options: { key: api_key, endpoint: "nonprod:sandbox", useBinaryProtocol: PROTOCOL == "msgpack" })
 client.connect()
 AWAIT_STATE client.connection.state == CONNECTED