feat(page-data): add validation suggestions, repair path, and thinking fixes

Map Page Data failure codes to Chinese remediation hints, trigger one-shot
goosed repair for remediable cases, and recover poisoned thinking sessions.
Route local DeepSeek through the no-think proxy via host.docker.internal so
tool rounds no longer hit reasoning_content 400; document gate and case-study
scenarios for event registration repair.

Co-authored-by: Cursor <cursoragent@cursor.com>

capabilities.mjs

@@ -162,9 +162,28 @@ export function resolveExcelMcpServerPath(overridePath, runtimeRoot) {
   );
 }
 
+function isGoosedMcpContainerized(sandboxMcp = null) {
+  const containerFlag = String(process.env.GOOSED_MCP_CONTAINERIZED ?? '').trim();
+  if (containerFlag) return containerFlag === '1';
+  return Boolean(sandboxMcp?.containerized);
+}
+
 function resolveBundledMcpRuntimeRoot(sandboxMcp) {
-  if (!sandboxMcp?.containerized || !sandboxMcp?.serverPath) return undefined;
-  return path.dirname(sandboxMcp.serverPath);
+  // Prefer the sandbox MCP's container-visible directory when present.
+  if (sandboxMcp?.containerized && sandboxMcp?.serverPath) {
+    return path.dirname(sandboxMcp.serverPath);
+  }
+  // tkmind-search / excel can still be enabled when sandbox-fs is absent
+  // (e.g. sandbox setup failed). Keep their stdio paths on the same
+  // container-canonical root as GOOSED_MCP_SERVER_PATH so reconcile does not
+  // oscillate between host and /opt/portal paths.
+  if (isGoosedMcpContainerized(sandboxMcp)) {
+    const serverPath = String(
+      sandboxMcp?.serverPath || process.env.GOOSED_MCP_SERVER_PATH || '',
+    ).trim();
+    if (serverPath) return path.dirname(serverPath);
+  }
+  return undefined;
 }
 
 export const CAPABILITY_CATALOG = [
@@ -609,7 +628,10 @@ export function buildAgentExtensionPolicy(
   if (capabilities.chat_recall) {
     extensions.push(makeExtension('platform', 'chatrecall', []));
   }
-  if (capabilities.context_memory) {
+  if (
+    capabilities.context_memory
+    && !extensions.some((ext) => ext.name === 'projectmemory')
+  ) {
     extensions.push(makeExtension('platform', 'projectmemory', []));
   }
   if (capabilities.memory_store) {