import CodexBarCoreimport Testing @Suitestruct ProviderConfigEnvironmentTests {    @Test    func appliesAPIKeyOverrideForZai() {        let config = ProviderConfig(id: .zai, apiKey: "z-token")        let env = ProviderConfigEnvironment.applyAPIKeyOverride(            base: [:],            provider: .zai,            config: config)         #expect(env[ZaiSettingsReader.apiTokenKey] == "z-token")    }     @Test    func leavesEnvironmentWhenAPIKeyMissing() {        let config = ProviderConfig(id: .zai, apiKey: nil)        let env = ProviderConfigEnvironment.applyAPIKeyOverride(            base: [ZaiSettingsReader.apiTokenKey: "existing"],            provider: .zai,            config: config)         #expect(env[ZaiSettingsReader.apiTokenKey] == "existing")    }}