refactor: separate local voice handlers and instructions

server/providers/openai/constants.js

@@ -0,0 +1,19 @@
+import { VOICE_MODELS } from '../../../src/voice/voiceCost.js';
+
+// Sourced from the shared voice-model registry so the client's cost estimate
+// can never be computed against a different model than the session runs on.
+const OPENAI_REALTIME_MODEL_DEFAULT = VOICE_MODELS.standard.id;
+
+const OPENAI_REALTIME_MODEL_MINI_DEFAULT = VOICE_MODELS.mini.id;
+
+const OPENAI_REALTIME_VOICE_DEFAULT = 'marin';
+
+const OPENAI_REALTIME_REASONING_DEFAULT = 'low';
+
+const OPENAI_REALTIME_CONTEXT_TOKENS_DEFAULT = 3000;
+
+const OPENAI_REALTIME_CONTEXT_RETENTION_DEFAULT = 0.5;
+
+const OPENAI_HUD_SUMMARY_MODEL_DEFAULT = 'gpt-5-nano';
+
+export { OPENAI_HUD_SUMMARY_MODEL_DEFAULT, OPENAI_REALTIME_MODEL_MINI_DEFAULT, OPENAI_REALTIME_MODEL_DEFAULT, OPENAI_REALTIME_VOICE_DEFAULT, OPENAI_REALTIME_REASONING_DEFAULT, OPENAI_REALTIME_CONTEXT_TOKENS_DEFAULT, OPENAI_REALTIME_CONTEXT_RETENTION_DEFAULT };