Add instance experimental setting for isolated workspaces

Introduce a singleton instance_settings store and experimental settings API, add the Experimental instance settings page, and gate execution workspace behavior behind the new enableIsolatedWorkspaces flag.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/shared/src/index.ts

@@ -120,6 +120,8 @@ export {
 
 export type {
   Company,
+  InstanceExperimentalSettings,
+  InstanceSettings,
   Agent,
   AgentPermissions,
   AgentKeyCreated,
@@ -239,6 +241,12 @@ export type {
   ProviderQuotaResult,
 } from "./types/index.js";
 
+export {
+  instanceExperimentalSettingsSchema,
+  patchInstanceExperimentalSettingsSchema,
+  type PatchInstanceExperimentalSettings,
+} from "./validators/index.js";
+
 export {
   createCompanySchema,
   updateCompanySchema,