No longer include 'IncludeThoughts' parameter with Gemini API

Google no longer provides thinking output via the API :(

pkg/provider/google/google.go

@@ -41,18 +41,11 @@ type Content struct {
 	Parts []ContentPart `json:"parts"`
 }
 
-type ThinkingConfig struct {
-	// Indicates whether to include thoughts in the response. If true, thoughts are returned
-	// only if the model supports thought and thoughts are available.
-	IncludeThoughts bool `json:"includeThoughts,omitempty"`
-}
-
 type GenerationConfig struct {
 	MaxOutputTokens *int            `json:"maxOutputTokens,omitempty"`
 	Temperature     *float32        `json:"temperature,omitempty"`
 	TopP            *float32        `json:"topP,omitempty"`
 	TopK            *int            `json:"topK,omitempty"`
-	ThinkingConfig  *ThinkingConfig `json:"thinkingConfig,omitempty"`
 }
 
 type GenerateContentRequest struct {
@@ -249,9 +242,6 @@ func createGenerateContentRequest(
 			MaxOutputTokens: &params.MaxTokens,
 			Temperature:     &params.Temperature,
 			TopP:            &params.TopP,
-			ThinkingConfig: &ThinkingConfig{
-				IncludeThoughts: true,
-			},
 		},
 	}