refactor: remove agent flavours, move provider to Agent (#2091)

crates/goose/src/config/extensions.rs

@@ -25,9 +25,9 @@ pub fn name_to_key(name: &str) -> String {
 }
 
 /// Extension configuration management
-pub struct ExtensionManager;
+pub struct ExtensionConfigManager;
 
-impl ExtensionManager {
+impl ExtensionConfigManager {
     /// Get the extension configuration if enabled -- uses key
     pub fn get_config(key: &str) -> Result<Option<ExtensionConfig>> {
         let config = Config::global();

crates/goose/src/config/mod.rs

@@ -6,7 +6,7 @@ pub mod permission;
 pub use crate::agents::ExtensionConfig;
 pub use base::{Config, ConfigError, APP_STRATEGY};
 pub use experiments::ExperimentManager;
-pub use extensions::{ExtensionEntry, ExtensionManager};
+pub use extensions::{ExtensionConfigManager, ExtensionEntry};
 pub use permission::PermissionManager;
 
 pub use extensions::DEFAULT_DISPLAY_NAME;