feat(core): Add model config for flash 3 (#78)

packages/core/src/config/defaultModelConfigs.ts

@@ -8,6 +8,10 @@ import { ThinkingLevel } from '@google/genai';
 import type { ModelConfigServiceConfig } from '../services/modelConfigService.js';
 import { DEFAULT_THINKING_MODE } from './models.js';
 
+// TODO(joshualitt): This is safe for orions belt, but this change SHOULD NOT
+// be merged when orions belt is merged with it's upstream.
+const FLASH_PREVIEW_MODEL_REVERT_BEFORE_MERGE = 'skyhawk';
+
 // The default model configs. We use `base` as the parent for all of our model
 // configs, while `chat-base`, a child of `base`, is the parent of the models
 // we use in the "chat" experience.
@@ -65,6 +69,12 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
         model: 'gemini-3-pro-preview',
       },
     },
+    'gemini-3-flash-preview': {
+      extends: 'chat-base-3',
+      modelConfig: {
+        model: FLASH_PREVIEW_MODEL_REVERT_BEFORE_MERGE,
+      },
+    },
     'gemini-2.5-pro': {
       extends: 'chat-base-2.5',
       modelConfig: {
@@ -188,6 +198,11 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
         model: 'gemini-3-pro-preview',
       },
     },
+    'chat-compression-3-flash': {
+      modelConfig: {
+        model: FLASH_PREVIEW_MODEL_REVERT_BEFORE_MERGE,
+      },
+    },
     'chat-compression-2.5-pro': {
       modelConfig: {
         model: 'gemini-2.5-pro',