diff --git a/.github/workflows/cd.yaml b/.github/workflows/cd.yaml
index 7fc21929..eba292d4 100644
--- a/.github/workflows/cd.yaml
+++ b/.github/workflows/cd.yaml
@@ -88,9 +88,10 @@ jobs:
               echo "   ✅ Cleaned _diag/pages"
             fi
 
-            # 2. 清理 RUNNER_TEMP
-            rm -rf "$RUNNER_TEMP"/* 2>/dev/null
-            echo "   ✅ Cleaned RUNNER_TEMP"
+            # 2. 清理 RUNNER_TEMP (排除 _runner_file_commands)
+            # 注意: 不能刪除整個目錄，否則會破壞 Runner 內部通訊
+            find "$RUNNER_TEMP" -mindepth 1 -maxdepth 1 ! -name "_runner_file_commands" -exec rm -rf {} \; 2>/dev/null || true
+            echo "   ✅ Cleaned RUNNER_TEMP (preserved _runner_file_commands)"
 
             # 3. 清理 Claude worktrees
             rm -rf .claude/worktrees 2>/dev/null
@@ -161,10 +162,11 @@ jobs:
       k3s-system: ${{ steps.filter.outputs.k3s-system }}
     steps:
       # 2026-03-29: Runner 診斷檔案清理 (防止並行衝突)
+      # 注意: 不能刪除 $RUNNER_TEMP/* 因為包含 _runner_file_commands
       - name: "Clean Runner Diagnostics"
         run: |
           RUNNER_ROOT=$(dirname "$(dirname "$RUNNER_TEMP")")
-          rm -rf "$RUNNER_TEMP"/* "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
+          rm -rf "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
           mkdir -p "$RUNNER_ROOT/_diag/pages" 2>/dev/null || true
 
       - uses: actions/checkout@v4
@@ -202,10 +204,11 @@ jobs:
       image_tag: ${{ steps.tag.outputs.tag }}
     steps:
       # 2026-03-29: Runner 診斷檔案清理 (防止並行衝突)
+      # 注意: 不能刪除 $RUNNER_TEMP/* 因為包含 _runner_file_commands
       - name: "Clean Runner Diagnostics"
         run: |
           RUNNER_ROOT=$(dirname "$(dirname "$RUNNER_TEMP")")
-          rm -rf "$RUNNER_TEMP"/* "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
+          rm -rf "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
           mkdir -p "$RUNNER_ROOT/_diag/pages" 2>/dev/null || true
 
       - uses: actions/checkout@v4
@@ -241,10 +244,11 @@ jobs:
       image_tag: ${{ steps.tag.outputs.tag }}
     steps:
       # 2026-03-29: Runner 診斷檔案清理 (防止並行衝突)
+      # 注意: 不能刪除 $RUNNER_TEMP/* 因為包含 _runner_file_commands
       - name: "Clean Runner Diagnostics"
         run: |
           RUNNER_ROOT=$(dirname "$(dirname "$RUNNER_TEMP")")
-          rm -rf "$RUNNER_TEMP"/* "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
+          rm -rf "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
           mkdir -p "$RUNNER_ROOT/_diag/pages" 2>/dev/null || true
 
       - uses: actions/checkout@v4
@@ -287,10 +291,11 @@ jobs:
     environment: production
     steps:
       # 2026-03-29: Runner 診斷檔案清理 (防止並行衝突)
+      # 注意: 不能刪除 $RUNNER_TEMP/* 因為包含 _runner_file_commands
       - name: "Clean Runner Diagnostics"
         run: |
           RUNNER_ROOT=$(dirname "$(dirname "$RUNNER_TEMP")")
-          rm -rf "$RUNNER_TEMP"/* "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
+          rm -rf "$RUNNER_ROOT/_diag/pages" .claude/worktrees 2>/dev/null || true
           mkdir -p "$RUNNER_ROOT/_diag/pages" 2>/dev/null || true
 
       - uses: actions/checkout@v4