Add README, Docker packaging, and workspace templates

Docker build verified locally (docker build -t volcanic-secretary .
succeeded on this machine). Step 6's manual end-to-end checklist
against a real Telegram bot was not run in this environment (no bot
token or owner id available); the checklist is kept in the README's
Tests section for the owner to run before relying on this in
production.

Claude-Session: https://claude.ai/code/session_01JtuZTCMW9TyogEmBgGf8JT

.dockerignore

@@ -0,0 +1,6 @@
+node_modules
+dist
+.env
+workspace
+docs
+.git