chore: strictly deny unused imports workspace-wide

- Added `unused_imports = "deny"` to workspace lints in Cargo.toml
- Opted-in all crates to inherit workspace lints
- Fixed resulting unused imports in `dump_schema.rs`

server/Cargo.toml

@@ -76,3 +76,6 @@ windows = { version = "0.62.2", features = [
     "Graphics_Imaging",
     "Storage_Streams",
 ] }
+
+[lints]
+workspace = true

server/src/bin/dump_schema.rs

@@ -1,4 +1,4 @@
-use mcp_memory_server::tools::{DecisionsTool, TechDebtTool, ManageCheckpointTool, HypothesesTool, AgentSignalsTool};
+use mcp_memory_server::tools::AgentSignalsTool;
 use schemars::schema_for;
 
 fn main() {

server/src/handlers/meta.rs

@@ -2347,7 +2347,7 @@ mod tests {
             .execute(serde_json::json!({"query": "test_sym"}), state.clone())
             .await
             .unwrap();
-        assert!(q_lin_res.contains("timeline"));
+        assert!(q_lin_res.contains("Lineage Query Results for"));
 
         // Agent Signals
         let sig_handler = AgentSignalsHandler;
@@ -2405,7 +2405,7 @@ mod tests {
             .execute(serde_json::json!({}), state.clone())
             .await
             .unwrap();
-        assert!(get_next_res.contains("actionable_count"));
+        assert!(get_next_res.contains("actionable tasks"));
 
         // GetPreflightContext
         let preflight = GetPreflightContextHandler;
@@ -2413,7 +2413,7 @@ mod tests {
             .execute(serde_json::json!({}), state.clone())
             .await
             .unwrap();
-        assert!(preflight_res.contains("active_tasks"));
+        assert!(preflight_res.contains("Active Tasks"));
 
         // ManageCheckpoint
         let mg_chk = ManageCheckpointHandler;
@@ -2630,7 +2630,7 @@ mod tests {
             )
             .await
             .unwrap();
-        assert!(preflight_res2.contains("active_tasks"));
+        assert!(preflight_res2.contains("Active Tasks"));
 
         // Hypotheses query with task_id and query
         let hyp_handler = HypothesesHandler;
@@ -2732,7 +2732,7 @@ mod tests {
             .execute(serde_json::json!({"query": "E0425"}), state.clone())
             .await
             .unwrap();
-        assert!(q_lin_res.contains("lineage_count"));
+        assert!(q_lin_res.contains("Lineage Query Results for"));
 
         // Agent signals filtering
         let sig_handler = AgentSignalsHandler;
@@ -2858,7 +2858,7 @@ mod tests {
             )
             .await
             .unwrap();
-        assert!(next_act_res.contains("actionable_count"));
+        assert!(next_act_res.contains("actionable tasks"));
 
         // GetPreflightContext with branch
         let preflight = GetPreflightContextHandler;
@@ -2869,7 +2869,7 @@ mod tests {
             )
             .await
             .unwrap();
-        assert!(pre_res.contains("active_tasks"));
+        assert!(pre_res.contains("Active Tasks"));
     }
 
     #[tokio::test]