Support Codex warm plugin task reuse and recovery (#17390)

packages/shared/src/validators/plugin.ts

@@ -179,6 +179,7 @@ export type SandboxProviderCapabilitiesInput = z.infer<typeof sandboxProviderCap
 export const pluginEnvironmentDriverDeclarationSchema = z.object({
   supportsTasks: z.boolean().optional(),
   freshWorkspaceVersion: z.literal(1).optional(),
+  warmTaskVersion: z.literal(1).optional(),
   driverKey: z.string().min(1).regex(
     /^[a-z0-9][a-z0-9._-]*$/,
     "Environment driver key must start with a lowercase alphanumeric and contain only lowercase letters, digits, dots, hyphens, or underscores",