fix: enforce final tag gating (#754) (thanks @mcinteerj)

src/utils/provider-utils.ts

@@ -7,10 +7,12 @@
  * (e.g. <think> and <final>) in the text stream, rather than using native
  * API fields for reasoning/thinking.
  */
-export function isReasoningTagProvider(provider: string | undefined | null): boolean {
+export function isReasoningTagProvider(
+  provider: string | undefined | null,
+): boolean {
   if (!provider) return false;
   const normalized = provider.trim().toLowerCase();
-  
+
   // Check for exact matches or known prefixes/substrings for reasoning providers
   if (
     normalized === "ollama" ||
@@ -19,7 +21,7 @@ export function isReasoningTagProvider(provider: string | undefined | null): boo
   ) {
     return true;
   }
-  
+
   // Handle google-antigravity and its model variations (e.g. google-antigravity/gemini-3)
   if (normalized.includes("google-antigravity")) {
     return true;
@@ -29,6 +31,6 @@ export function isReasoningTagProvider(provider: string | undefined | null): boo
   if (normalized.includes("minimax")) {
     return true;
   }
-  
+
   return false;
 }