daemon: add run-agent RPC for queuing agent jobs

Adds `poc-memory daemon run-agent <type> <count>` CLI command that
sends an RPC to the daemon to queue agent runs, instead of spawning
separate processes.

Co-Authored-By: Kent Overstreet <kent.overstreet@linux.dev>

poc-memory/src/agents/daemon.rs

@@ -1277,6 +1277,17 @@ pub fn rpc_consolidate() -> Result<(), String> {
     }
 }
 
+pub fn rpc_run_agent(agent: &str, count: usize) -> Result<(), String> {
+    let cmd = format!("run-agent {} {}", agent, count);
+    match send_rpc(&cmd) {
+        Some(resp) => {
+            println!("{}", resp.trim());
+            Ok(())
+        }
+        None => Err("Daemon not running.".into()),
+    }
+}
+
 fn read_status_socket() -> Option<DaemonStatus> {
     use std::io::Read as _;
     use std::os::unix::net::UnixStream;