F5 thalamus: cached channel status, refresh on entry

Channel status is cached on App and refreshed when switching
to F5, not polled every render frame. Shows connected/disconnected
status and unread count per channel daemon.

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

src/bin/consciousness.rs

@@ -964,9 +964,13 @@ async fn run(cli: cli::CliArgs) -> Result<()> {
                 dirty = true;
             }
 
-            // Render tick — only redraws if dirty
+            // Render tick
             _ = render_interval.tick() => {
-                app.running_processes = session.process_tracker.list().await.len() as u32;
+                let new_count = session.process_tracker.list().await.len() as u32;
+                if new_count != app.running_processes {
+                    app.running_processes = new_count;
+                    dirty = true;
+                }
             }
 
             // DMN timer (only when no turn is running)