feat: enhance message context with full ID support for replies and caching

- Updated message processing to include full message IDs alongside short IDs for better context resolution.
- Improved reply handling by caching inbound messages, allowing for accurate sender and body resolution without exposing dropped content.
- Adjusted tests to validate the new full ID properties and their integration into the message handling workflow.

src/auto-reply/templating.ts

@@ -38,10 +38,14 @@ export type MsgContext = {
   AccountId?: string;
   ParentSessionKey?: string;
   MessageSid?: string;
+  /** Provider-specific full message id when MessageSid is a shortened alias. */
+  MessageSidFull?: string;
   MessageSids?: string[];
   MessageSidFirst?: string;
   MessageSidLast?: string;
   ReplyToId?: string;
+  /** Provider-specific full reply-to id when ReplyToId is a shortened alias. */
+  ReplyToIdFull?: string;
   ReplyToBody?: string;
   ReplyToSender?: string;
   ForwardedFrom?: string;