hive-agent: run the event store in WAL and give turn-stats writes a busy timeout

hive-agent/src/events.rs

@@ -150,6 +150,7 @@ impl EventStore {
             let _ = std::fs::create_dir_all(parent);
         }
         let conn = Connection::open(path)?;
+        crate::sqlite_writer::configure_wal(&conn)?;
         conn.execute_batch(SCHEMA)?;
         Ok(Self {
             conn: Mutex::new(conn),