Refactor CLI and Twilio modules; add helper tests and comments

src/auto-reply/templating.ts

@@ -11,8 +11,8 @@ export type TemplateContext = MsgContext & {
 	IsNewSession?: string;
 };
 
+// Simple {{Placeholder}} interpolation using inbound message context.
 export function applyTemplate(str: string, ctx: TemplateContext) {
-	// Simple {{Placeholder}} interpolation using inbound message context.
 	return str.replace(/{{\s*(\w+)\s*}}/g, (_, key) => {
 		const value = (ctx as Record<string, unknown>)[key];
 		return value == null ? "" : String(value);