feat: measure bounded worker execution with durable verification

docs/reports/data/phase-6-execution-load/environment.json

@@ -0,0 +1,55 @@
+{
+  "date_local": "2026-09-20",
+  "timezone": "Asia/Shanghai",
+  "test_go": "go1.25.14",
+  "declared_go": "1.27.1",
+  "temporary_modfile": true,
+  "mysql": "8.4.10",
+  "innodb_flush_log_at_trx_commit": 1,
+  "sync_binlog": 1,
+  "mysql_global_transaction_isolation": "REPEATABLE-READ",
+  "orbit_transaction_isolation": "READ COMMITTED",
+  "mysql_max_connections": 151,
+  "innodb_buffer_pool_size_bytes": 134217728,
+  "orbit_db_max_open": 20,
+  "orbit_db_max_idle": 5,
+  "docker_vm_cpus": 12,
+  "docker_vm_memory_bytes": 12529274880,
+  "architecture": "arm64",
+  "orbit_processes": 1,
+  "mysql_nodes": 1,
+  "worker_processes": 1,
+  "worker_connections_normal": 2,
+  "worker_capacity_each": 4,
+  "queue_max_concurrency": 4,
+  "queue_rate_per_second": 10,
+  "metrics_enabled": false,
+  "cpu_memory_limits": "No dedicated limits; shared local Docker VM, other workloads possible",
+  "profiles_in_order": [
+    "short",
+    "mixed",
+    "long",
+    "deadline"
+  ],
+  "prior_task_counts": [
+    0,
+    96,
+    192,
+    198
+  ],
+  "fresh_disposable_database": true,
+  "network": "Go runner shares MySQL container network namespace; loopback HTTP/WSS and MySQL",
+  "schema_verification": {
+    "schema_version": 28,
+    "migration_count": 28,
+    "foreign_key_count": 0,
+    "required_index_count": 6,
+    "complete": true
+  },
+  "source_sha256": {
+    "sdk/go/cmd/orbit-exec-load/main.go": "bcaecce6be9fe8aca7a0d93b4671cbc460b1083232a77d13a04642a96ae45d81",
+    "sdk/go/cmd/orbit-exec-load/measure.go": "ea0a22e6598e12e175f281fd45d511db32e241e532f5bdcf40ca615392fa586e",
+    "sdk/go/cmd/orbit-exec-load/measure_test.go": "bda2ce1e946745e149c7471462d511ad3bcf66352a8d14fab57b2aa1ef280c3d",
+    "sdk/go/cmd/orbit-exec-load/report.go": "3d1da9acc1e63142bd3b4b37041d609e61e172eef56ff27467f1803dee857272"
+  }
+}