fix: allow Codex Spark with Codex OAuth (#25640)

packages/opencode/src/plugin/codex.ts

@@ -14,7 +14,14 @@ const ISSUER = "https://auth.openai.com"
 const CODEX_API_ENDPOINT = "https://chatgpt.com/backend-api/codex/responses"
 const OAUTH_PORT = 1455
 const OAUTH_POLLING_SAFETY_MARGIN_MS = 3000
-const ALLOWED_MODELS = new Set(["gpt-5.5", "gpt-5.2", "gpt-5.3-codex", "gpt-5.4", "gpt-5.4-mini"])
+const ALLOWED_MODELS = new Set([
+  "gpt-5.5",
+  "gpt-5.2",
+  "gpt-5.3-codex",
+  "gpt-5.3-codex-spark",
+  "gpt-5.4",
+  "gpt-5.4-mini",
+])
 
 interface PkceCodes {
   verifier: string