Add workspace runtime controls

Expose project and execution workspace runtime defaults, control endpoints, startup recovery, and operator UI for start/stop/restart flows.

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

packages/shared/src/validators/execution-workspace.ts

@@ -13,6 +13,7 @@ export const executionWorkspaceConfigSchema = z.object({
   teardownCommand: z.string().optional().nullable(),
   cleanupCommand: z.string().optional().nullable(),
   workspaceRuntime: z.record(z.unknown()).optional().nullable(),
+  desiredState: z.enum(["running", "stopped"]).optional().nullable(),
 }).strict();
 
 export const executionWorkspaceCloseReadinessStateSchema = z.enum([