fix(agent): clarify auxiliary provider auth failures - #56842
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This was referenced Jul 2, 2026
This was referenced Jul 2, 2026
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This was referenced Jul 30, 2026
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Fixes #56810.\n\nExplicit auxiliary providers that use OAuth/ADC/SDK credentials (for example Vertex) no longer fall through to an invented _API_KEY error when client construction returns None. The fallback error now preserves API-key guidance only for actual api_key providers and gives setup/auth guidance for non-API-key providers.\n\nTests: scripts/run_tests.sh tests/agent/test_auxiliary_client.py -k ExplicitProviderUnavailableErrors