fix(ci): unshallow gate replay history

.woodpecker/ci.yml

@@ -72,9 +72,12 @@ steps:
   # step-level `when`, because a gate can be disabled by changes outside its own path.
   gate-verify:
     image: *node_image
+    # Woodpecker's shallow marker makes merge-base reject even present parents;
+    # full history is required for prospective own-tree replay.
     commands:
       - *enable_pnpm
       - apk add --no-cache bubblewrap
+      - if [ -f .git/shallow ]; then git fetch --unshallow --no-tags origin; fi
       - pnpm gate:verify
     depends_on:
       - install