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"body": "There are places where as a last gasp to load the AI model preferences we fall back to \"llama3.1\" or \"gps-oss-120b\". We shouldn't do that, because if the setting ends up empty for any reason AND these models don't actually exist on the target server, all we do is tell you there's a problem with the AI provider after we try and fail to call the fallback.\n\nInstead, empty or missing model names should produce an explicit configuration error immediately.\n\n---\n\n## Acceptance Criteria / Gherkin Specs\n\n```gherkin\nScenario: Empty model name produces a clear config error — not a silent fallback\n Given the AI provider is set to Ollama or vLLM\n And the model name field is empty or whitespace-only\n When I attempt to evolve\n Then I see an explicit configuration error: \"Model name is required for [provider]\"\n And nixmac does NOT silently attempt to call \"llama3.1\" or \"gps-oss-120b\"\n\nScenario: Backend rejects requests with missing model configuration\n Given any local AI provider is configured\n When the backend receives an evolve request with no model name\n Then it returns a configuration validation error\n And it does not attempt to call any hard-coded fallback model\n\nScenario: Settings UI validates model name before saving\n Given I am on the Settings page configuring a local provider\n When I clear the model name and try to save\n Then I see an inline validation error on the model name field\n And the settings are not saved without a valid model name\n```",
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