docs: update human and LLM docs and enhance tool/list schemas with actionable next steps

server/src/models.rs

@@ -311,7 +311,6 @@ pub struct AgentSignal {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use axum::http::StatusCode;
     use axum::response::IntoResponse;
     use crate::error::AppError;