Keep exported header normalization helper as supported API

Co-authored-by: Eric Allam <eric@trigger.dev>

Author: cursoragent

packages/ai/src/chatTransport.ts

@@ -502,9 +502,6 @@ function normalizeHeaders(
 
 /**
  * Converts supported header input shapes into a normalized plain object.
- *
- * @deprecated This helper is primarily exposed for advanced integrations and tests.
- * Most users should rely on `TriggerChatTransport` internals to normalize request headers.
  */
 export function normalizeTriggerChatHeaders(
   headers: TriggerChatHeadersInput | undefined