Persist dynamic extension config so we can resume recipe sessions w/ extensions (#4331)

crates/goose/src/session/extension_data.rs

@@ -1,6 +1,7 @@
 // Extension data management for sessions
 // Provides a simple way to store extension-specific data with versioned keys
 
+use crate::config::ExtensionConfig;
 use anyhow::Result;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
@@ -95,6 +96,23 @@ impl TodoState {
     }
 }
 
+/// Enabled extensions state implementation for storing which extensions are active
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct EnabledExtensionsState {
+    pub extensions: Vec<ExtensionConfig>,
+}
+
+impl ExtensionState for EnabledExtensionsState {
+    const EXTENSION_NAME: &'static str = "enabled_extensions";
+    const VERSION: &'static str = "v0";
+}
+
+impl EnabledExtensionsState {
+    pub fn new(extensions: Vec<ExtensionConfig>) -> Self {
+        Self { extensions }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

crates/goose/src/session/mod.rs

@@ -2,4 +2,5 @@ pub mod extension_data;
 mod legacy;
 pub mod session_manager;
 
+pub use extension_data::{EnabledExtensionsState, ExtensionData, ExtensionState, TodoState};
 pub use session_manager::{Session, SessionInsights, SessionManager};