idle: afk command, configurable session timeout, fix block_reason

Add `poc-daemon afk` to immediately mark Kent as away, allowing the
idle timer to fire without waiting for the session active timeout.

Add `poc-daemon session-timeout <secs>` to configure how long after
the last message Kent counts as "present" (default 15min, persisted).

Fix block_reason() to report "kent present" and "in turn" states
that were checked in the tick but not in the diagnostic output.

src/bin/poc-daemon/main.rs

@@ -84,6 +84,13 @@ enum Command {
         /// Duration in seconds
         seconds: Option<u32>,
     },
+    /// Mark Kent as AFK (immediately allow idle timer to fire)
+    Afk,
+    /// Set session active timeout in seconds (how long after last message Kent counts as "present")
+    SessionTimeout {
+        /// Timeout in seconds
+        seconds: f64,
+    },
     /// Set idle timeout in seconds (how long before autonomous prompt)
     IdleTimeout {
         /// Timeout in seconds
@@ -249,6 +256,16 @@ async fn client_main(cmd: Command) -> Result<(), Box<dyn std::error::Error>> {
                     req.get().set_seconds(seconds.unwrap_or(300));
                     req.send().promise.await?;
                 }
+                Command::Afk => {
+                    daemon.afk_request().send().promise.await?;
+                    println!("marked AFK");
+                }
+                Command::SessionTimeout { seconds } => {
+                    let mut req = daemon.session_timeout_request();
+                    req.get().set_seconds(seconds);
+                    req.send().promise.await?;
+                    println!("session timeout = {seconds}s");
+                }
                 Command::IdleTimeout { seconds } => {
                     let mut req = daemon.idle_timeout_request();
                     req.get().set_seconds(seconds);