feat: add retention policy and stability verification

scripts/test-stability.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+# P1 生产稳定性定向回归：真实 MySQL 锁等待/死锁、保留期磁盘增长，
+# 以及两个独立 Orbit 进程之间的重连风暴和慢消费者。
+set -eu
+
+TASK_GO=${GO:-go}
+if [ -z "${ORBIT_TEST_MYSQL_DSN:-}" ]; then
+	printf '%s\n' 'ORBIT_TEST_MYSQL_DSN must point to a disposable MySQL 8.4 database.' >&2
+	exit 2
+fi
+
+"$TASK_GO" test -race -count=1 -run 'TestIntegration(WithTxRetriesPreCommitDeadlock|RetentionPolicyIsSharedAuditedAndIdempotent|RetentionDiskGrowthAndPreview|FairDispatchApplicationIsolation|WorkflowVersionAndRaces)$' ./internal/storage/mysql
+
+if [ -z "${ORBIT_TEST_SERVER_BINARY:-}" ] || [ -z "${ORBIT_TEST_WORKER_URL:-}" ] || [ -z "${ORBIT_TEST_WORKER_CREDENTIALS_FILE:-}" ]; then
+	printf '%s\n' 'ORBIT_TEST_SERVER_BINARY, ORBIT_TEST_WORKER_URL and ORBIT_TEST_WORKER_CREDENTIALS_FILE are required for the cross-node WebSocket checks.' >&2
+	exit 2
+fi
+
+(cd sdk/go && "$TASK_GO" test -race -count=1 -run 'TestIntegrationEventProcess(SlowConsumerPeerProgress|CrossNodeReconnectStorm)$' -v .)