diff --git a/policy/governance.md b/policy/governance.md
index a869f17e..93bbe34b 100644
--- a/policy/governance.md
+++ b/policy/governance.md
@@ -59,7 +59,9 @@ LOCAL_READY 只用于局部恢复；新任务入口始终校验严格 READY，
 一致、工作区干净且组件状态未变；收据 `root_target/immediate_target` 等于卡片范围；目标只允许快进落后，回退或分叉拒绝。
 远端跟踪目标 ref 缺失时，local 模式的 precheck 与 `resume-local` 只在当前登记任务身份、本地 R0 对象、R0 为本地 HEAD 祖先、
 工作区干净、分支/worktree、组件与范围全部核验通过时继续。缺失或过期的远端 ref 从不证明新鲜度；只要有任一目标历史可用，
-其祖先关系须一致。正式 Review 与合入仍须先完成新鲜的权威同步。
+其祖先关系须一致。local precheck 刷新失败时，远端不可查询或目标 ref 缺失按上述本地核验继续；远端可查询且已有缓存目标时，
+通告提交须本地存在且为缓存目标后代才继续，回退/分叉或通告提交本地缺失无法比较均判 REMOTE_UNVERIFIED。
+正式 Review 与合入仍须先完成新鲜的权威同步。
 `resume-delivery` 仍要求 READY 且收据目标等于当前权威目标。LOCAL_READY 始终是 SELF 本地工作记录，
 不能用于建任务、正式交付、Review、合入、CI、GATE 或 REPLAY。
 旧收据允许作为历史证据原样导入，不自动成为当前恢复或交付准入；格式继续为 schema 1。
diff --git a/scripts/task.sh b/scripts/task.sh
index 02a0607d..16a3827e 100755
--- a/scripts/task.sh
+++ b/scripts/task.sh
@@ -18,14 +18,15 @@ fetch_target() {
   git rev-parse --verify "refs/remotes/origin/${TARGET_BRANCH}^{commit}" >/dev/null \
     || { echo "[verdict] REMOTE_UNVERIFIED — target commit missing" >&2; return 6; }
 }
-target_rewound() { # 0 仅当 origin 通告的目标提交本地可用且不是缓存 origin/<target> 的后代；不可达或无法比较返回 1
+target_history() { # 输出 ok（远端不可查询/目标 ref 缺失/无缓存目标/通告提交为缓存后代）、rewound（回退或分叉）或 uncomparable（通告提交本地缺失或无法比较）
   local cached advertised rc=0
-  cached=$(git rev-parse -q --verify "refs/remotes/origin/${TARGET_BRANCH}^{commit}" 2>/dev/null) || return 1
+  cached=$(git rev-parse -q --verify "refs/remotes/origin/${TARGET_BRANCH}^{commit}" 2>/dev/null) || { echo ok; return 0; }
   advertised=$(git ls-remote origin "refs/heads/${TARGET_BRANCH}" 2>/dev/null \
-    | awk -v ref="refs/heads/${TARGET_BRANCH}" '$2 == ref && !seen { print $1; seen = 1 }') || return 1
-  [ -n "$advertised" ] && git cat-file -e "${advertised}^{commit}" 2>/dev/null || return 1
+    | awk -v ref="refs/heads/${TARGET_BRANCH}" '$2 == ref && !seen { print $1; seen = 1 }') || { echo ok; return 0; }
+  [ -n "$advertised" ] || { echo ok; return 0; }
+  git cat-file -e "${advertised}^{commit}" 2>/dev/null || { echo uncomparable; return 0; }
   git merge-base --is-ancestor "$cached" "$advertised" 2>/dev/null || rc=$?
-  [ "$rc" -eq 1 ]
+  case "$rc" in 0) echo ok ;; 1) echo rewound ;; *) echo uncomparable ;; esac
 }
 check_worktree() { python3 "${SCRIPT_DIR}/check-worktree.py" "$1"; }
 main_worktree_root() { git worktree list --porcelain -z | python3 -c 'import os,sys; print(os.fsdecode(sys.stdin.buffer.read().split(bytes([0]),1)[0][9:]))'; }
@@ -150,9 +151,15 @@ cmd_precheck() {
   fi
   if [ "$mode" = local ]; then
     python3 "${SCRIPT_DIR}/evidence.py" --local-context --active || return 2
-    if [ "$remote_fresh" -eq 0 ] && target_rewound; then
-      echo "[verdict] REMOTE_UNVERIFIED — origin/${TARGET_BRANCH} rewound or diverged from the cached target; preserve local work and reconcile the target history"
-      return 6
+    if [ "$remote_fresh" -eq 0 ]; then
+      case "$(target_history)" in
+        rewound)
+          echo "[verdict] REMOTE_UNVERIFIED — origin/${TARGET_BRANCH} rewound or diverged from the cached target; preserve local work and reconcile the target history"
+          return 6 ;;
+        uncomparable)
+          echo "[verdict] REMOTE_UNVERIFIED — advertised origin/${TARGET_BRANCH} commit is missing locally and cannot be compared with the cached target; preserve local work and retry the refresh"
+          return 6 ;;
+      esac
     fi
     [ "$remote_fresh" -eq 1 ] || echo "[remote-freshness] unavailable — LOCAL_READY rests on local task context only"
     echo "[verdict] LOCAL_READY — existing task may continue authorized local work; final delivery still requires latest-target sync and checks"