feat(browser): 增加跨 page orchestration 能力

新增显式跨页 orchestration block，支持开页、切页、关页后执行单页逻辑。

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

lib/mcp/ccs-browser-server.cjs

@@ -2638,6 +2638,15 @@ const SUPPORTED_ORCHESTRATION_BLOCK_TYPES = new Set([
   'run_replay_sequence',
   'assert_query',
   'sequence',
+  'open_page_then_run',
+  'select_page_then_run',
+  'close_page_then_continue',
+]);
+
+const CROSS_PAGE_BLOCK_TYPES = new Set([
+  'open_page_then_run',
+  'select_page_then_run',
+  'close_page_then_continue',
 ]);
 
 const SUPPORTED_ASSERTION_OPERATORS = new Set(['equals', 'contains', 'gt', 'gte', 'lt', 'lte']);
@@ -2805,6 +2814,16 @@ function validateSequenceStep(step) {
   }
 }
 
+function requireCrossPageRunBlock(block) {
+  if (!block.args || typeof block.args !== 'object' || !block.args.run || typeof block.args.run !== 'object') {
+    throw new Error('cross-page run block is required');
+  }
+  if (CROSS_PAGE_BLOCK_TYPES.has(block.args.run.type)) {
+    throw new Error('nested cross-page blocks are not supported');
+  }
+  return block.args.run;
+}
+
 function normalizeRecordedEvent(pageId, event) {
   if (!event || typeof event !== 'object') {
     return null;
@@ -5208,6 +5227,31 @@ async function handleCancelReplay() {
 }
 
 async function executeOrchestrationBlock(session, block) {
+  if (block.type === 'select_page_then_run') {
+    const selectResult = await handleSelectPage(block.args.select || {});
+    const match = /pageId: (.+)/.exec(selectResult);
+    const selectedPageId = match?.[1]?.trim() || session.pageId;
+    const runBlock = requireCrossPageRunBlock(block);
+    const childSession = { ...session, pageId: selectedPageId };
+    await executeOrchestrationBlock(childSession, runBlock);
+    return;
+  }
+
+  if (block.type === 'open_page_then_run') {
+    const openResult = await handleOpenPage(block.args.open || {});
+    const match = /pageId: (.+)/.exec(openResult);
+    const openedPageId = match?.[1]?.trim() || session.pageId;
+    const runBlock = requireCrossPageRunBlock(block);
+    const childSession = { ...session, pageId: openedPageId };
+    await executeOrchestrationBlock(childSession, runBlock);
+    return;
+  }
+
+  if (block.type === 'close_page_then_continue') {
+    await handleClosePage(block.args.close || {});
+    return;
+  }
+
   if (block.type === 'wait_for_then_click') {
     await handleWaitFor({ pageId: session.pageId, ...block.args.wait });
     await handleClick({ pageId: session.pageId, ...block.args.click });