feat(tui): implement agent turn engine for background processing and enhance input handling

apps/infrastructure/src/tools/plan.rs

@@ -3,6 +3,7 @@
 use crate::tools::{Tool, ToolCtx};
 use anyhow::Result;
 use serde_json::{json, Value};
+use tracing::info;
 
 pub struct PlanEnter;
 
@@ -51,11 +52,28 @@ impl Tool for PlanReady {
     fn parameters(&self) -> Value {
         json!({
             "type": "object",
-            "properties": {}
+            "properties": {
+                "plan": {
+                    "type": "string",
+                    "description": "The final plan content"
+                }
+            },
+            "required": ["plan"]
         })
     }
 
-    fn run(&self, _ctx: &ToolCtx, _args: &Value) -> Result<String> {
-        Ok("Plan is ready. Starting execution.".to_string())
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let plan_content = crate::tools::arg_str(args, "plan")?;
+        info!("plan ready: {} chars", plan_content.len());
+        // Persist the plan to session directory for reference
+        let plan_dir = ctx.session_dir.join("plans");
+        if std::fs::create_dir_all(&plan_dir).is_ok() {
+            let filename = format!("plan-{}.md", chrono::Utc::now().format("%Y%m%d_%H%M%S"));
+            let path = plan_dir.join(&filename);
+            let _ = std::fs::write(&path, &plan_content);
+            Ok(format!("Plan saved to {filename}. Starting execution."))
+        } else {
+            Ok("Plan is ready. Starting execution.".to_string())
+        }
     }
 }