fix(model-fallback): align OpenAI fallback resolution across CLI and runtime

Keep install-time and runtime model tables in sync, stop OpenAI-only misrouting when OpenCode Go is present, and add valid OpenAI fallbacks for atlas, metis, and sisyphus-junior.

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

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

src/cli/openai-only-model-catalog.ts

@@ -17,6 +17,7 @@ export function isOpenAiOnlyAvailability(availability: ProviderAvailability): bo
     availability.native.openai &&
     !availability.native.claude &&
     !availability.native.gemini &&
+    !availability.opencodeGo &&
     !availability.opencodeZen &&
     !availability.copilot &&
     !availability.zai &&