logs: assert non-empty agent names, fix debug.log path

- save_agent_log: assert name is not empty (panic to find the bug)
- AutoAgent:🆕 assert name is not empty
- dbglog: write to daemon/ subdir instead of toplevel logs/

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

src/agent/oneshot.rs

@@ -85,6 +85,7 @@ pub fn set_stats(name: &str, stats: PersistedStats) {
 /// Save agent conversation to JSON log file.
 /// Used by both mind-run agents and CLI-run agents.
 pub async fn save_agent_log(name: &str, agent: &std::sync::Arc<Agent>) -> RunStats {
+    assert!(!name.is_empty(), "save_agent_log called with empty name");
     let dir = dirs::home_dir().unwrap_or_default()
         .join(format!(".consciousness/logs/{}", name));
     let ctx = agent.context.lock().await;
@@ -231,6 +232,7 @@ impl AutoAgent {
         temperature: f32,
         priority: i32,
     ) -> Self {
+        assert!(!name.is_empty(), "AutoAgent::new called with empty name");
         Self {
             name, tools, steps,
             current_phase: String::new(),