runtime: unify final delivery and startup preconditions

src/startup-preconditions.ts

@@ -0,0 +1,18 @@
+export const STARTUP_PRECONDITION_EXIT_CODE = 78;
+
+export class StartupPreconditionError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'StartupPreconditionError';
+  }
+}
+
+export function isStartupPreconditionError(
+  error: unknown,
+): error is StartupPreconditionError {
+  return error instanceof StartupPreconditionError;
+}
+
+export function resolveStartupFailureExitCode(error: unknown): number {
+  return isStartupPreconditionError(error) ? STARTUP_PRECONDITION_EXIT_CODE : 1;
+}