remove and cleanup unused code (#4074)

crates/goose/src/session/storage.rs

@@ -49,8 +49,7 @@ pub struct SessionMetadata {
     pub description: String,
     /// ID of the schedule that triggered this session, if any
     pub schedule_id: Option<String>,
-    /// ID of the project this session belongs to, if any
-    pub project_id: Option<String>,
+
     /// Number of messages in the session
     pub message_count: usize,
     /// The total number of tokens used in the session. Retrieved from the provider's last usage.
@@ -78,7 +77,6 @@ impl<'de> Deserialize<'de> for SessionMetadata {
             description: String,
             message_count: usize,
             schedule_id: Option<String>, // For backward compatibility
-            project_id: Option<String>,  // For backward compatibility
             total_tokens: Option<i32>,
             input_tokens: Option<i32>,
             output_tokens: Option<i32>,
@@ -100,7 +98,6 @@ impl<'de> Deserialize<'de> for SessionMetadata {
             description: helper.description,
             message_count: helper.message_count,
             schedule_id: helper.schedule_id,
-            project_id: helper.project_id,
             total_tokens: helper.total_tokens,
             input_tokens: helper.input_tokens,
             output_tokens: helper.output_tokens,
@@ -125,7 +122,6 @@ impl SessionMetadata {
             working_dir,
             description: String::new(),
             schedule_id: None,
-            project_id: None,
             message_count: 0,
             total_tokens: None,
             input_tokens: None,