Add basic cron scheduler to goose-server (#2621)

crates/goose/src/session/storage.rs

@@ -25,6 +25,8 @@ pub struct SessionMetadata {
     pub working_dir: PathBuf,
     /// A short description of the session, typically 3 words or less
     pub description: String,
+    /// ID of the schedule that triggered this session, if any
+    pub schedule_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.
@@ -51,6 +53,7 @@ impl<'de> Deserialize<'de> for SessionMetadata {
         struct Helper {
             description: String,
             message_count: usize,
+            schedule_id: Option<String>, // For backward compatibility
             total_tokens: Option<i32>,
             input_tokens: Option<i32>,
             output_tokens: Option<i32>,
@@ -71,6 +74,7 @@ impl<'de> Deserialize<'de> for SessionMetadata {
         Ok(SessionMetadata {
             description: helper.description,
             message_count: helper.message_count,
+            schedule_id: helper.schedule_id,
             total_tokens: helper.total_tokens,
             input_tokens: helper.input_tokens,
             output_tokens: helper.output_tokens,
@@ -94,6 +98,7 @@ impl SessionMetadata {
         Self {
             working_dir,
             description: String::new(),
+            schedule_id: None,
             message_count: 0,
             total_tokens: None,
             input_tokens: None,