feat(orchestrator): enforce Page Data validation gate

services/orchestrator/admin-config.mjs

@@ -151,6 +151,10 @@ function runtimeState(config, env = process.env) {
     env.MEMIND_ORCHESTRATOR_EXECUTION_HANDOFF_ENABLED,
     false,
   );
+  const environmentPageDataValidationGate = normalizeBoolean(
+    env.MEMIND_ORCHESTRATOR_PAGE_DATA_VALIDATION_GATE_ENABLED,
+    false,
+  );
   const configured = config.primaryEngine !== WORKFLOW_ENGINE.LANGGRAPH || Boolean(config.serviceUrl);
   let reason = null;
   if (killSwitch) reason = 'kill_switch';
@@ -175,6 +179,8 @@ function runtimeState(config, env = process.env) {
   const shadowObservationEnabled = !reason
     && environmentShadowObservationGate
     && shadowObservationRequested;
+  const pageDataValidationGateEnabled = environmentPageDataValidationGate
+    && shadowObservationEnabled;
   return {
     killSwitch,
     configured,
@@ -203,6 +209,19 @@ function runtimeState(config, env = process.env) {
             : 'environment_shadow_observation_gate_disabled',
       environmentGate: environmentShadowObservationGate,
     },
+    pageDataValidationGate: {
+      requested: environmentPageDataValidationGate,
+      enabled: pageDataValidationGateEnabled,
+      failClosed: true,
+      reason: pageDataValidationGateEnabled
+        ? null
+        : !environmentPageDataValidationGate
+          ? 'environment_page_data_validation_gate_disabled'
+          : !shadowObservationEnabled
+            ? 'shadow_observation_not_enabled'
+            : 'page_data_validation_gate_disabled',
+      environmentGate: environmentPageDataValidationGate,
+    },
     executionHandoff: {
       implemented: EXECUTION_HANDOFF_IMPLEMENTED,
       requested: executionHandoffRequested,