chore: import upstream snapshot with attribution

apps/sim/lib/webhooks/utils.ts

@@ -0,0 +1,36 @@
+/**
+ * Pure utility functions for webhook processing
+ * This file has NO server-side dependencies to ensure it can be safely imported in client-side code
+ */
+
+/**
+ * Convert square bracket notation to TwiML XML tags
+ * Used by Twilio Voice tools to allow LLMs to generate TwiML without XML escaping issues
+ *
+ * @example
+ * "[Response][Say]Hello[/Say][/Response]"
+ * -> "<Response><Say>Hello</Say></Response>"
+ */
+export function convertSquareBracketsToTwiML(twiml: string | undefined): string | undefined {
+  if (!twiml) {
+    return twiml
+  }
+  // Replace [Tag] with <Tag> and [/Tag] with </Tag>
+  return twiml.replace(/\[(\/?[^\]]+)\]/g, '<$1>')
+}
+
+/**
+ * Merges fields from source into target, but only if they don't exist in the base config.
+ * Used to preserve system-managed fields while respecting user-provided values.
+ */
+export function mergeNonUserFields(
+  target: Record<string, unknown>,
+  source: Record<string, unknown>,
+  userProvided: Record<string, unknown>
+): void {
+  for (const [key, value] of Object.entries(source)) {
+    if (!(key in userProvided)) {
+      target[key] = value
+    }
+  }
+}