style: Apply cargo fix for unused variables

server/src/handlers/meta.rs

@@ -609,7 +609,7 @@ impl McpTool for TechDebtHandler {
     async fn execute(&self, args: Value, state: Arc<MemoryState>) -> crate::error::Result<String> {
         let req: TechDebtTool = serde_json::from_value(args).map_err(|e| e.to_string())?;
         match req {
-            TechDebtTool::Log { description, title, ideal_solution, git_commit, git_branch, symbol_references, line_range, namespace, severity, repo_name, file_path, workaround, effort_estimate } => {
+            TechDebtTool::Log { description, title: _, ideal_solution, git_commit, git_branch, symbol_references: _, line_range, namespace, severity, repo_name, file_path, workaround, effort_estimate } => {
                 let ns = namespace.clone().unwrap_or_else(crate::models::default_namespace);
                 let desc = description;
                 let ideal = ideal_solution.unwrap_or_default();
@@ -1203,7 +1203,7 @@ impl McpTool for ManageCheckpointHandler {
 
                 Ok(format!("Checkpoint '{}' created successfully.", name))
             }
-            ManageCheckpointTool::Restore { name_or_id, namespace } => {
+            ManageCheckpointTool::Restore { name_or_id, namespace: _ } => {
                 let name = name_or_id.ok_or_else(|| crate::error::AppError::Internal("name_or_id is required".to_string()))?;
                 let target_dir = state.base_dir.join("checkpoints").join(&name);
 
@@ -1245,7 +1245,7 @@ impl McpTool for ManageCheckpointHandler {
 
                 Ok(format!("Checkpoint '{}' restored successfully.", name))
             }
-            ManageCheckpointTool::List { namespace } => {
+            ManageCheckpointTool::List { namespace: _ } => {
                 let mut list = Vec::new();
                 let checkpoints_dir = state.base_dir.join("checkpoints");
                 if let Ok(entries) = std::fs::read_dir(&checkpoints_dir) {
@@ -1263,7 +1263,7 @@ impl McpTool for ManageCheckpointHandler {
                 }
                 Ok(serde_yaml::to_string(&list)?)
             }
-            ManageCheckpointTool::Delete { name_or_id, namespace } => {
+            ManageCheckpointTool::Delete { name_or_id, namespace: _ } => {
                 let name = name_or_id.ok_or_else(|| crate::error::AppError::Internal("name_or_id is required".to_string()))?;
                 let target_dir = state.base_dir.join("checkpoints").join(&name);
                 if target_dir.exists() {
@@ -1483,7 +1483,7 @@ impl McpTool for HypothesesHandler {
 
                 Ok(format!("Hypothesis '{}' logged successfully.", hyp_id))
             }
-            HypothesesTool::Query { query, task_id, status } => {
+            HypothesesTool::Query { query, task_id, status: _ } => {
                 let hypotheses = state.code.hypotheses.read_with(|h| h.clone());
                 let filtered: Vec<_> = hypotheses
                     .into_iter()