fix(acceptance): 完善跨版本验收状态收口

生产流量处于旧失败验收 Run 的 validation 状态时，允许新验收接管任意已验证的 Git 祖先 release，而非仅允许 release manifest 的直接 base；仍保留 Run 状态、镜像 digest、revision 与当前集群 release CAS 校验。\n\n允许 pending Run 在激活前异常时直接标记为 failed，避免验收工具在 CAS 或网络错误后遗留无法结束的 Run。新增祖先关系脚本测试及临时 PostgreSQL 集成验证。\n\n验证：Go 全量测试、go vet、临时 PostgreSQL 集成测试、bash -n、ShellCheck、manual-release-test。

tests/release/production-acceptance-script-test.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT
+
+script=$root/scripts/cluster/run-production-acceptance.sh
+awk '
+  /^is_release_ancestor\(\)/ { capture = 1 }
+  capture && /^create_and_activate_run\(\)/ { exit }
+  capture { print }
+' "$script" >"$tmp/is-release-ancestor.sh"
+
+# shellcheck source=/dev/null
+source "$tmp/is-release-ancestor.sh"
+
+cluster_root=$tmp/repository
+git init -q "$cluster_root"
+git -C "$cluster_root" config user.name 'Acceptance Script Test'
+git -C "$cluster_root" config user.email 'acceptance-script-test@example.invalid'
+git -C "$cluster_root" commit --allow-empty -qm first
+first=$(git -C "$cluster_root" rev-parse HEAD)
+git -C "$cluster_root" commit --allow-empty -qm second
+git -C "$cluster_root" commit --allow-empty -qm third
+third=$(git -C "$cluster_root" rev-parse HEAD)
+
+is_release_ancestor "$first" "$third"
+if is_release_ancestor "$third" "$first"; then
+  echo 'descendant release was accepted as an ancestor' >&2
+  exit 1
+fi
+if is_release_ancestor invalid "$third"; then
+  echo 'invalid release identifier was accepted as an ancestor' >&2
+  exit 1
+fi
+
+echo 'production_acceptance_script_tests=PASS'