feat(browser): 增加 orchestration 执行策略增强

为 block 与 sequence step 增加最小 continueOnError 语义，并补充 failures 汇总输出。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/mcp/ccs-browser-server.cjs

@@ -2433,11 +2433,22 @@ function formatOrchestrationSummary(session) {
     `pageIndex: ${session.pageIndex}`,
     `blockCount: ${session.blockCount}`,
     `completedBlocks: ${session.completedBlocks}`,
+    `failedCount: ${session.failedCount || 0}`,
     `currentBlockIndex: ${session.currentBlockIndex}`,
     `failedBlockIndex: ${session.failedBlockIndex === null ? 'none' : session.failedBlockIndex}`,
     `error: ${session.error || 'none'}`,
     `status: ${session.status}`,
   ];
+  if (Array.isArray(session.failures) && session.failures.length > 0) {
+    session.failures.forEach((failure, index) => {
+      lines.push(`failure[${index}].blockIndex: ${failure.blockIndex}`);
+      lines.push(
+        `failure[${index}].sequenceStepIndex: ${failure.sequenceStepIndex === null ? 'none' : failure.sequenceStepIndex}`
+      );
+      lines.push(`failure[${index}].type: ${failure.type}`);
+      lines.push(`failure[${index}].message: ${failure.message}`);
+    });
+  }
   if (session.failedSequenceStepIndex !== null && session.failedSequenceStepIndex !== undefined) {
     lines.push(`failedSequenceStepIndex: ${session.failedSequenceStepIndex}`);
   }
@@ -2656,6 +2667,12 @@ function formatOrchestrationError(error) {
   return { message };
 }
 
+function pushOrchestrationFailure(session, details) {
+  session.failures = session.failures || [];
+  session.failures.push(details);
+  session.failedCount = session.failures.length;
+}
+
 function requireOrchestrationBlocks(toolArgs) {
   const blocks = Array.isArray(toolArgs.blocks) ? toolArgs.blocks : null;
   if (!blocks || blocks.length === 0) {
@@ -5151,7 +5168,17 @@ async function executeSequenceSteps(session, block) {
     try {
       await executeOrchestrationBlock(session, step);
     } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      pushOrchestrationFailure(session, {
+        blockIndex: session.currentBlockIndex,
+        sequenceStepIndex: index,
+        type: step.type,
+        message,
+      });
       session.failedSequenceStepIndex = index;
+      if (step.continueOnError === true) {
+        continue;
+      }
       throw error;
     }
   }
@@ -5162,8 +5189,26 @@ async function executeOrchestrationBlocks(session) {
     const block = session.blocks[index];
     session.currentBlockIndex = index;
     validateOrchestrationBlock(block);
-    await executeOrchestrationBlock(session, block);
-    session.completedBlocks = index + 1;
+    try {
+      await executeOrchestrationBlock(session, block);
+      session.completedBlocks = index + 1;
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      if (session.failedSequenceStepIndex === null || session.failedSequenceStepIndex === undefined) {
+        pushOrchestrationFailure(session, {
+          blockIndex: index,
+          sequenceStepIndex: null,
+          type: block.type,
+          message,
+        });
+      }
+      if (block.continueOnError === true) {
+        session.failedSequenceStepIndex = null;
+        session.completedBlocks = index + 1;
+        continue;
+      }
+      throw error;
+    }
   }
 }