feat(tui): update system message for clarity and conciseness in tool usage instructions

apps/infrastructure/src/tools/plan.rs

@@ -29,8 +29,16 @@ impl Tool for PlanEnter {
         })
     }
 
-    fn run(&self, _ctx: &ToolCtx, args: &Value) -> Result<String> {
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
         let plan_text = crate::tools::arg_str(args, "plan")?;
+        
+        let plan_path = ctx.session_dir.join("PLAN.md");
+        let _ = std::fs::write(&plan_path, &plan_text);
+        if let Some(events) = &ctx.turn_events {
+            let mut q = events.lock().unwrap();
+            q.push_back(crate::TurnEvent::PlanUpdate(plan_text.clone()));
+        }
+
         Ok(format!(
             "Plan entered (length: {} chars). Waiting for approval...",
             plan_text.len()
@@ -72,6 +80,15 @@ impl Tool for PlanReady {
             let path = plan_dir.join(&filename);
             std::fs::write(&path, &plan_content)
                 .map_err(|e| anyhow::anyhow!("failed to save plan: {e}"))?;
+            
+            // Also save the latest plan
+            let plan_path = ctx.session_dir.join("PLAN.md");
+            let _ = std::fs::write(&plan_path, &plan_content);
+            if let Some(events) = &ctx.turn_events {
+                let mut q = events.lock().unwrap();
+                q.push_back(crate::TurnEvent::PlanUpdate(plan_content.clone()));
+            }
+
             Ok(format!("Plan saved to {filename}. Starting execution."))
         } else {
             Ok("Plan is ready. Starting execution.".to_string())