Move To-Do Tool to Session Scope from Agent Scope (#4157)

crates/goose/src/session/storage.rs

@@ -64,9 +64,11 @@ pub struct SessionMetadata {
     pub accumulated_input_tokens: Option<i32>,
     /// The number of output tokens used in the session. Accumulated across all messages.
     pub accumulated_output_tokens: Option<i32>,
+    /// Session-scoped TODO list content
+    pub todo_content: Option<String>,
 }
 
-// Custom deserializer to handle old sessions without working_dir
+// Custom deserializer to handle old sessions without working_dir and todo_content
 impl<'de> Deserialize<'de> for SessionMetadata {
     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where
@@ -84,6 +86,7 @@ impl<'de> Deserialize<'de> for SessionMetadata {
             accumulated_input_tokens: Option<i32>,
             accumulated_output_tokens: Option<i32>,
             working_dir: Option<PathBuf>,
+            todo_content: Option<String>, // For backward compatibility
         }
 
         let helper = Helper::deserialize(deserializer)?;
@@ -105,6 +108,7 @@ impl<'de> Deserialize<'de> for SessionMetadata {
             accumulated_input_tokens: helper.accumulated_input_tokens,
             accumulated_output_tokens: helper.accumulated_output_tokens,
             working_dir,
+            todo_content: helper.todo_content,
         })
     }
 }
@@ -129,6 +133,7 @@ impl SessionMetadata {
             accumulated_total_tokens: None,
             accumulated_input_tokens: None,
             accumulated_output_tokens: None,
+            todo_content: None,
         }
     }
 }