fix: deploy_guard假漂移过滤——update-index刷新stat缓存+内容级diff二次确认(空diff不回滚不告警),heavy_run/regime_perf_daily反复被假回滚(0insertion0deletion)根因

deploy/profile-scripts/deploy_guard.py

@@ -79,6 +79,10 @@ def git(*args, check=True):
 
 # ── 1. 代码漂移检测与回滚 ──
 def check_code_drift():
+    # 2026-08-25 假漂移过滤：git status 受 stat 缓存抖动误报 M（touch/mtime 变化即报），
+    # 导致 heavy_run.sh/regime_perf_daily.sh 反复被"假回滚"+告警噪音。
+    # 先 refresh 索引 stat 缓存，再对报 M 的文件做内容级 diff 二次确认，无实质差异不回滚。
+    git("update-index", "--refresh", check=False)
     out = git("status", "--porcelain", "--", *CODE_PATHS)
     if not out:
         return
@@ -94,6 +98,16 @@ def check_code_drift():
             untracked.append(path)
         else:
             modified.append(path)
+    if modified:
+        # 内容级二次确认：diff HEAD 为空的 = stat 抖动假漂移，不回滚
+        real_modified = [f for f in modified
+                         if git("diff", "--name-only", "HEAD", "--", f, check=False).strip()]
+        if not real_modified:
+            log(f"DRIFT假报(stat缓存抖动,内容无实质差异,不回滚): {modified}")
+            modified = []
+        elif len(real_modified) < len(modified):
+            log(f"DRIFT部分假报: 真实修改={real_modified}, 假抖动={ [f for f in modified if f not in real_modified] }")
+            modified = real_modified
     if modified:
         diff_stat = git("diff", "--stat", "--", *modified, check=False)
         log(f"DRIFT: 检测到 {len(modified)} 个代码文件未入库改动: {modified}")