test(e2e): use canonical sandbox receipt field

Signed-off-by: Drew Newberry <anewberry@nvidia.com>

Author: drew

crates/openshell-cli/tests/provider_commands_integration.rs

@@ -1964,7 +1964,7 @@ async fn provider_readiness_mutations_reject_unbound_receipts_before_output_or_p
         ("kind", |receipt| {
             receipt.kind = ProviderMutationKind::Observe.into();
         }),
-        ("sandbox_name", |receipt| {
+        ("sandbox", |receipt| {
             receipt.desired.as_mut().expect("desired identity").sandbox = "other".to_string();
         }),
         ("sandbox_id", |receipt| {

e2e/rust/tests/provider_readiness.rs

@@ -1021,7 +1021,7 @@ impl MutationReceipt {
         if receipt["mutation_id"] != mutation_id
             || receipt["provider_name"] != provider
             || receipt["kind"] != kind
-            || desired["sandbox_name"] != sandbox.name
+            || desired["sandbox"] != sandbox.name
             || status["state"] != "persisted"
             || status["wait_outcome"] != "not_requested"
         {
@@ -1062,7 +1062,7 @@ impl MutationReceipt {
             || self.receipt["provider_name"] != previous.receipt["provider_name"]
             || self.receipt["workspace"] != previous.receipt["workspace"]
             || desired["sandbox_id"] != preceding["sandbox_id"]
-            || desired["sandbox_name"] != preceding["sandbox_name"]
+            || desired["sandbox"] != preceding["sandbox"]
             || desired["provider_env_revision"] == preceding["provider_env_revision"]
         {
             return Err(