fix: preserve existing agent guide files during install

install.sh

@@ -91,6 +91,23 @@ sync_file() {
   fi
 }
 
+sync_guide_file() {
+  local src="$1"
+  local dst="$2"
+  local create_msg="$3"
+  local skip_msg="$4"
+
+  if [ ! -f "$dst" ]; then
+    mkdir -p "$(dirname "$dst")"
+    cp "$src" "$dst"
+    log_info "$create_msg"
+    TOTAL_NEW=$((TOTAL_NEW + 1))
+  else
+    log_info "$skip_msg"
+    TOTAL_SKIPPED=$((TOTAL_SKIPPED + 1))
+  fi
+}
+
 install_layout() {
   local input="$1"
   local skill_dir
@@ -147,11 +164,11 @@ install_layout() {
 
   guide_src_path="$TMP_DIR/$GUIDE_SRC"
   if [ -f "$guide_src_path" ]; then
-    sync_file \
+    sync_guide_file \
       "$guide_src_path" \
       "$GUIDE_DST" \
-      "✨ 新增项目引导: $GUIDE_DST" \
-      "🔄 更新项目引导: $GUIDE_DST （本地版本已备份为 ${GUIDE_DST}.local.bak）"
+      "✨ 新增项目引导: ${GUIDE_DST}" \
+      "⏭️  跳过项目引导: ${GUIDE_DST}（已存在，保持原样）"
   fi
 
   INSTALLED_TARGETS="${INSTALLED_TARGETS}${INSTALLED_TARGETS:+, }$TARGET"
@@ -188,12 +205,12 @@ echo "  📁 目标目录: $INSTALLED_TARGETS"
 echo "  📦 版本:     $VERSION"
 echo ""
 echo "  ✨ 新增: $TOTAL_NEW"
-echo "  🔄 更新: $TOTAL_UPDATED（本地版本已备份为 .local.bak）"
+echo "  🔄 更新: ${TOTAL_UPDATED}（本地版本已备份为 .local.bak）"
 echo "  ⏭️  无变化: $TOTAL_SKIPPED"
 echo ""
 
 if [ "$TOTAL_UPDATED" -gt 0 ]; then
-  log_warn "有 $TOTAL_UPDATED 个文件被更新，本地修改已备份为 .local.bak"
+  log_warn "有 ${TOTAL_UPDATED} 个文件被更新，本地修改已备份为 .local.bak"
   log_warn "如需恢复本地版本: mv SKILL.md.local.bak SKILL.md"
   log_warn "如需对比差异:     diff SKILL.md SKILL.md.local.bak"
 fi