Add enabled toggle to AutoAgent, simplify unconscious scheduling

- AutoAgent.enabled: universal toggle for any auto agent
- Subconscious: should_trigger checks auto.enabled
- Unconscious: simplified from consolidation-plan-driven budgets to
  simple loop with cooldown. Static agent list, max 2 concurrent.
- TUI: unconscious agents shown in F3 subconscious screen under
  separator, with enabled/running/runs display

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/user/mod.rs

@@ -107,6 +107,7 @@ struct App {
     should_quit: bool,
     context_info: Option<ContextInfo>,
     agent_state: Vec<crate::mind::SubconsciousSnapshot>,
+    unconscious_state: Vec<crate::mind::UnconsciousSnapshot>,
     walked_count: usize,
     channel_status: Vec<ChannelStatus>,
     idle_info: Option<IdleInfo>,
@@ -130,6 +131,7 @@ impl App {
             should_quit: false,
             context_info: None,
             agent_state: Vec::new(),
+            unconscious_state: Vec::new(),
             walked_count: 0,
             channel_status: Vec::new(), idle_info: None,
         }
@@ -370,6 +372,7 @@ async fn run(
         idle_state.decay_ewma();
         app.update_idle(&idle_state);
         app.agent_state = mind.subconscious_snapshots().await;
+        app.unconscious_state = mind.unconscious_snapshots().await;
         app.walked_count = mind.subconscious_walked().await.len();
         if !startup_done {
             if let Ok(mut ag) = agent.state.try_lock() {