refactor: apply zero-unwrap policy and optimize locks in store.rs and handlers

server/src/tools.rs

@@ -314,6 +314,7 @@ pub struct AddSessionSummaryTool {
 
 /// Get a timeline of major project events.
 #[derive(Debug, Deserialize, Serialize, JsonSchema)]
+#[allow(dead_code)]
 pub struct GetProjectTimelineTool {
     /// Optional namespace to restrict the timeline to.
     pub namespace: Option<String>,