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

apps/infrastructure/src/tools/bash_tools.rs

@@ -78,8 +78,25 @@ impl Tool for BashKill {
     }
 
     fn run(&self, _ctx: &ToolCtx, args: &Value) -> Result<String> {
-        let _job_id = crate::tools::arg_str(args, "job_id")?;
-        // In production, look up and kill the job in BashControl
-        Ok(format!("Killed background job '{}'", _job_id))
+        let job_id = crate::tools::arg_str(args, "job_id")?;
+        info!("bash_kill called for job: {job_id}");
+        // Try to kill by PID (if job_id is numeric) or by process name
+        if let Ok(pid) = job_id.parse::<u32>() {
+            use std::process::Command;
+            match Command::new("kill").arg(pid.to_string()).output() {
+                Ok(output) if output.status.success() => {
+                    Ok(format!("Killed background job '{job_id}' (PID {pid})"))
+                }
+                Ok(output) => {
+                    let stderr = String::from_utf8_lossy(&output.stderr);
+                    Ok(format!("Failed to kill job '{job_id}': {stderr}"))
+                }
+                Err(e) => {
+                    Ok(format!("Failed to kill job '{job_id}': {e}"))
+                }
+            }
+        } else {
+            Ok(format!("Invalid job ID '{job_id}' — expected numeric PID"))
+        }
     }
 }