fix(acme-http-client): Destroy keep-alive HTTP agents and DNS client on shutdown to allow process exit; add destroy() on AcmeHttpClient and AcmeClient, wire agents into requests, and call client/smartdns destroy during SmartAcme.stop; documentation clarifications and expanded README (error handling, examples, default retry values).

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartacme',
-  version: '9.0.0',
+  version: '9.0.1',
   description: 'A TypeScript-based ACME client for LetsEncrypt certificate management with a focus on simplicity and power.'
 }