fix(installer): add upgrade path safety checks

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

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

src/cli/config-manager/write-omo-config.test.ts

@@ -18,6 +18,7 @@ const installConfig: InstallConfig = {
   hasOpencodeZen: false,
   hasZaiCodingPlan: false,
   hasKimiForCoding: false,
+  hasOpencodeGo: false,
 }
 
 function getRecord(value: unknown): Record<string, unknown> {