test(jetstream): cover bulk-create debounce and flush semantics

Uses @std/testing/time FakeTime to deterministically advance the
500ms debounce. Covers accumulation, timer restart on each push,
the bulk-create verb + payload shape, and per-did buffer
isolation with cleared state after flush.

deno.lock

@@ -7,8 +7,10 @@
     "jsr:@oak/commons@1": "1.0.0",
     "jsr:@oak/oak@^17.2.0": "17.2.0",
     "jsr:@std/assert@1": "1.0.18",
+    "jsr:@std/async@^1.4.0": "1.4.0",
     "jsr:@std/bytes@1": "1.0.4",
     "jsr:@std/crypto@1": "1.0.3",
+    "jsr:@std/data-structures@^1.1.0": "1.1.0",
     "jsr:@std/encoding@1": "1.0.6",
     "jsr:@std/encoding@^1.0.5": "1.0.6",
     "jsr:@std/fmt@1": "1.0.9",
@@ -20,6 +22,7 @@
     "jsr:@std/path@1": "1.1.4",
     "jsr:@std/path@1.0": "1.0.9",
     "jsr:@std/path@^1.1.1": "1.1.4",
+    "jsr:@std/testing@1": "1.0.19",
     "npm:@opensearch-project/opensearch@3": "3.6.0",
     "npm:@opensearch-project/opensearch@^3.6.0": "3.6.0",
     "npm:@skyware/jetstream@~0.2.5": "0.2.5",
@@ -71,12 +74,18 @@
         "jsr:@std/internal@^1.0.12"
       ]
     },
+    "@std/async@1.4.0": {
+      "integrity": "4d70b008634f571cff9b554090d628c76141c32613aae0ff283fd5fa23d0c379"
+    },
     "@std/bytes@1.0.4": {
       "integrity": "11a0debe522707c95c7b7ef89b478c13fb1583a7cfb9a85674cd2cc2e3a28abc"
     },
     "@std/crypto@1.0.3": {
       "integrity": "a2a32f51ddef632d299e3879cd027c630dcd4d1d9a5285d6e6788072f4e51e7f"
     },
+    "@std/data-structures@1.1.0": {
+      "integrity": "c35ae4ad5d8e41a38573c2fe3e19b18ea2505f63cfea201edcb8720aca1f7f58"
+    },
     "@std/encoding@1.0.6": {
       "integrity": "ca87122c196e8831737d9547acf001766618e78cd8c33920776c7f5885546069"
     },
@@ -110,6 +119,13 @@
       "dependencies": [
         "jsr:@std/internal@^1.0.12"
       ]
+    },
+    "@std/testing@1.0.19": {
+      "integrity": "f4236172365b216728dc3cc8b5e80a9f4c33083d1e4ede7613d5b25b4014898e",
+      "dependencies": [
+        "jsr:@std/async",
+        "jsr:@std/data-structures"
+      ]
     }
   },
   "npm": {
@@ -231,6 +247,7 @@
       "jsr:@db/sqlite@0.13",
       "jsr:@oak/oak@^17.2.0",
       "jsr:@std/assert@1",
+      "jsr:@std/testing@1",
       "npm:@opensearch-project/opensearch@^3.6.0",
       "npm:@skyware/jetstream@~0.2.5"
     ]