fix: address Cubic findings for provider preserve fallback

- Reorder resolveFallbackProviderID: providerHint now checked before global connected-provider cache
- Revert require('bun:test') hack to standard ESM import in fallback-chain-from-models.test.ts

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/plugin/event.ts

@@ -177,16 +177,16 @@ export function createEventHandler(args: {
       return lastKnownModel.providerID;
     }
 
-    const connectedProvider = readConnectedProvidersCache()?.[0];
-    if (connectedProvider) {
-      return connectedProvider;
-    }
-
     const normalizedProviderHint = providerHint?.trim();
     if (normalizedProviderHint) {
       return normalizedProviderHint;
     }
 
+    const connectedProvider = readConnectedProvidersCache()?.[0];
+    if (connectedProvider) {
+      return connectedProvider;
+    }
+
     return "opencode";
   };
 

src/shared/fallback-chain-from-models.test.ts

@@ -1,5 +1,4 @@
-declare const require: (name: string) => any
-const { describe, test, expect } = require("bun:test")
+import { describe, test, expect } from "bun:test"
 import { buildFallbackChainFromModels, parseFallbackModelEntry } from "./fallback-chain-from-models"
 
 describe("fallback-chain-from-models", () => {