fix(agent): ensure fallback clients honor Vertex AI selection#129

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128-agent-fallback-model-path-drops-use_vertex_ai-causing-401-unauthenticated-on-gemini-vertex-setups10xHub/Agentflow:128-agent-fallback-model-path-drops-use_vertex_ai-causing-401-unauthenticated-on-gemini-vertex-setupsCopy head branch name to clipboard