feat(09-02): add batch summary with failure emphasis

- Add Is Batch Complete IF node to check loop termination
- Add Build Batch Summary code node with failure-first format
- Add Send Batch Summary HTTP node with Back to List button
- Connect Is Batch Complete true output to summary flow
- Connect Is Batch Complete false output back to Batch Loop
- Summary shows failures with reasons prominently
- Warnings shown in detail (<=3) or summary (>3)
- Success count shown last

n8n-workflow.json

@@ -4747,6 +4747,38 @@
         -400
       ]
     },
+    {
+      "parameters": {
+        "conditions": {
+          "options": {
+            "caseSensitive": true,
+            "leftValue": "",
+            "typeValidation": "strict"
+          },
+          "conditions": [
+            {
+              "id": "is-batch-complete",
+              "leftValue": "={{ $json.isComplete }}",
+              "rightValue": true,
+              "operator": {
+                "type": "boolean",
+                "operation": "equals"
+              }
+            }
+          ],
+          "combinator": "and"
+        },
+        "options": {}
+      },
+      "id": "if-batch-complete",
+      "name": "Is Batch Complete",
+      "type": "n8n-nodes-base.if",
+      "typeVersion": 2,
+      "position": [
+        5620,
+        -400
+      ]
+    },
     {
       "parameters": {
         "jsCode": "// Prepare batch stop data for execution\n// Input from Check Batch Stop Expired (not expired)\nconst data = $json;\n\n// containerNames is a comma-separated array from callback\nconst containerNames = data.containerNames || [];\n\nreturn {\n  json: {\n    allMatched: containerNames.map(name => ({ Name: name, Id: null })),\n    action: 'stop',\n    chatId: data.chatId,\n    messageId: data.messageId\n  }\n};"
@@ -4772,6 +4804,37 @@
         1560,
         900
       ]
+    },
+    {
+      "parameters": {
+        "jsCode": "// Build batch summary message with failure emphasis\n// Input: final batch state with results array and counters\nconst data = $json;\n\nconst action = data.action;\nconst results = data.results || [];\nconst successCount = data.successCount || 0;\nconst failureCount = data.failureCount || 0;\nconst warningCount = data.warningCount || 0;\nconst totalCount = data.totalCount || results.length;\nconst chatId = data.chatId;\nconst progressMessageId = data.progressMessageId;\n\n// Build summary text - failures emphasized first\nlet summaryText = `<b>Batch ${action} Complete</b>\\n\\n`;\n\n// Show failures first and prominently\nconst failures = results.filter(r => r.status === 'error');\nif (failures.length > 0) {\n  summaryText += `<b>\\u274c Failed (${failures.length}):</b>\\n`;\n  for (const f of failures) {\n    summaryText += `\\u2022 ${f.name}: ${f.reason || 'Unknown error'}\\n`;\n  }\n  summaryText += '\\n';\n}\n\n// Show warnings summary (not individual) per context discretion\nconst warnings = results.filter(r => r.status === 'warning');\nif (warnings.length > 0) {\n  // If 3 or fewer warnings, show details; otherwise just count\n  if (warnings.length <= 3) {\n    summaryText += `<b>\\u26a0\\ufe0f Warnings (${warnings.length}):</b>\\n`;\n    for (const w of warnings) {\n      summaryText += `\\u2022 ${w.name}: ${w.reason}\\n`;\n    }\n    summaryText += '\\n';\n  } else {\n    summaryText += `\\u26a0\\ufe0f Warnings: ${warnings.length} (containers already in desired state)\\n\\n`;\n  }\n}\n\n// Show success count\nif (successCount > 0) {\n  summaryText += `<b>\\u2705 Successful:</b> ${successCount}/${totalCount}\\n`;\n} else if (failureCount === 0 && warningCount > 0) {\n  // All warnings, no success/failures\n  summaryText += `No changes needed for ${totalCount} container(s)\\n`;\n}\n\nreturn {\n  json: {\n    chatId: chatId,\n    messageId: progressMessageId,\n    text: summaryText,\n    hasFailures: failureCount > 0\n  }\n};"
+      },
+      "id": "code-build-batch-summary",
+      "name": "Build Batch Summary",
+      "type": "n8n-nodes-base.code",
+      "typeVersion": 2,
+      "position": [
+        5740,
+        -400
+      ]
+    },
+    {
+      "parameters": {
+        "method": "POST",
+        "url": "=https://api.telegram.org/bot{{ $env.TELEGRAM_BOT_TOKEN }}/editMessageText",
+        "sendBody": true,
+        "specifyBody": "json",
+        "jsonBody": "={{ JSON.stringify({ chat_id: $json.chatId, message_id: $json.messageId, text: $json.text, parse_mode: 'HTML', reply_markup: { inline_keyboard: [[{ text: 'Back to List', callback_data: 'list:0' }]] } }) }}",
+        "options": {}
+      },
+      "id": "http-send-batch-summary",
+      "name": "Send Batch Summary",
+      "type": "n8n-nodes-base.httpRequest",
+      "typeVersion": 4.2,
+      "position": [
+        5960,
+        -400
+      ]
     }
   ],
   "connections": {
@@ -6954,6 +7017,24 @@
     },
     "Prepare Next Iteration": {
       "main": [
+        [
+          {
+            "node": "Is Batch Complete",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Is Batch Complete": {
+      "main": [
+        [
+          {
+            "node": "Build Batch Summary",
+            "type": "main",
+            "index": 0
+          }
+        ],
         [
           {
             "node": "Batch Loop",
@@ -6963,6 +7044,17 @@
         ]
       ]
     },
+    "Build Batch Summary": {
+      "main": [
+        [
+          {
+            "node": "Send Batch Summary",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
     "Prepare Batch Stop Exec": {
       "main": [
         [