feat(engine): node.finished 全事件补 attempt 审计字段（无人值守审批对账：对面 actionId=runId:stepId:attempt）

目标：审计侧可对账'第几次尝试成功/失败'，为无人值守高危动作的审批绑定提供键
代码逻辑：六处 node.finished 发射点统一带 state.attempt（初值1，重试循环内递增）；可选字段向后兼容，无事件对象精确断言受影响
验证：引擎域 24/24 全绿 + 新增契约测试（重试3次终态 attempt=3、跳过=1、全事件 ≥1）；typecheck 归零
风险与回滚：低——纯新增可选字段，revert 即回

packages/rpa-core/src/engine/runtime.ts

@@ -255,14 +255,14 @@ async function executeNode(node: FlowNode, ctx: RunContext, states: Map<string,
     state.status = "failed";
     state.error = error.toRunError();
     state.finishedAt = new Date().toISOString();
-    ctx.emit({ type: "node.finished", nodeId: node.id, status: "failed", error: state.error, durationMs: 0, evidence: [] });
+    ctx.emit({ type: "node.finished", nodeId: node.id, status: "failed", error: state.error, durationMs: 0, evidence: [], attempt: state.attempt });
     throw error;
   }
 
   if (node.enabled === false) {
     state.status = "skipped";
     state.finishedAt = new Date().toISOString();
-    ctx.emit({ type: "node.finished", nodeId: node.id, status: "skipped", durationMs: 0, evidence: [] });
+    ctx.emit({ type: "node.finished", nodeId: node.id, status: "skipped", durationMs: 0, evidence: [], attempt: state.attempt });
     return undefined;
   }
 
@@ -371,6 +371,7 @@ async function executeNode(node: FlowNode, ctx: RunContext, states: Map<string,
       checkpointId: node.id,
       resumable,
       executor: "local",
+      attempt: state.attempt,
       ...(resumable ? { idempotencyKey: `${ctx.runId}:${node.id}` } : {})
     });
     return result;
@@ -379,7 +380,7 @@ async function executeNode(node: FlowNode, ctx: RunContext, states: Map<string,
       state.status = "skipped";
       state.finishedAt = new Date().toISOString();
       state.durationMs = Date.now() - startMs;
-      ctx.emit({ type: "node.finished", nodeId: node.id, status: "skipped", durationMs: state.durationMs, evidence: [] });
+      ctx.emit({ type: "node.finished", nodeId: node.id, status: "skipped", durationMs: state.durationMs, evidence: [], attempt: state.attempt });
       throw error;
     }
     const runtimeError = asRuntimeError(error, node, component.id);
@@ -395,7 +396,8 @@ async function executeNode(node: FlowNode, ctx: RunContext, states: Map<string,
         status: "cancelled",
         error: runtimeError,
         durationMs: state.durationMs,
-        evidence: []
+        evidence: [],
+        attempt: state.attempt
       });
       throw error;
     }
@@ -412,7 +414,8 @@ async function executeNode(node: FlowNode, ctx: RunContext, states: Map<string,
       status: state.status,
       error: runtimeError,
       durationMs: state.durationMs,
-      evidence: []
+      evidence: [],
+      attempt: state.attempt
     });
     if (skip) return undefined;
     throw error;