fix: gate clear_thinking behind an opt-in flag (Z.AI-only) (#10439)

Signed-off-by: Douwe Osinga <douwe.osinga@gmail.com>
Co-authored-by: Jared Manfredi <j.manfredi@draftkings.com>
Co-authored-by: Douwe Osinga <douwe.osinga@gmail.com>

crates/goose/src/config/declarative_providers.rs

@@ -215,6 +215,7 @@ pub fn create_custom_provider(
         setup_steps: vec![],
         fast_model: None,
         preserves_thinking,
+        emit_clear_thinking: false,
         setup: None,
     };
 
@@ -296,6 +297,7 @@ pub fn update_custom_provider(params: UpdateCustomProviderParams) -> Result<()>
             setup_steps: existing_config.setup_steps,
             fast_model: existing_config.fast_model.clone(),
             preserves_thinking,
+            emit_clear_thinking: existing_config.emit_clear_thinking,
             setup: existing_config.setup,
         };
 
@@ -567,6 +569,7 @@ mod tests {
             setup_steps: Vec::new(),
             fast_model: None,
             preserves_thinking: true,
+            emit_clear_thinking: false,
             setup: None,
         }
     }

crates/goose/src/providers/anthropic_def.rs

@@ -133,6 +133,7 @@ mod tests {
             setup_steps: vec![],
             fast_model: None,
             preserves_thinking: false,
+            emit_clear_thinking: false,
             setup: None,
         }
     }

crates/goose/src/providers/huggingface.rs

@@ -545,6 +545,7 @@ mod tests {
             setup_steps: vec![],
             fast_model: None,
             preserves_thinking: true,
+            emit_clear_thinking: false,
             setup: None,
         }
     }

crates/goose/src/providers/ollama_cloud.rs

@@ -472,6 +472,7 @@ mod tests {
             setup_steps: vec![],
             fast_model: None,
             preserves_thinking: true,
+            emit_clear_thinking: false,
             setup: None,
         }
     }

crates/goose/src/providers/provider_registry.rs

@@ -400,6 +400,7 @@ mod tests {
             setup_steps: vec![],
             fast_model: None,
             preserves_thinking: false,
+            emit_clear_thinking: false,
             setup: None,
         }
     }