feat(#1466): add sessions table + turn_stats.session_id capture for per-session stats

hive-ag3nt/src/turn.rs

@@ -652,6 +652,10 @@ async fn run_claude(prompt: &str, files: &TurnFiles, bus: &Bus) -> Result<(bool,
     let effort = bus.effort();
     let resume = !bus.take_skip_continue();
     if !resume {
+        // Flag the fresh session so the bin loop mints a new `sessions`
+        // row + stamps its id onto this turn's stats (and subsequent
+        // turns until the next fresh start).
+        bus.mark_fresh_session();
         bus.emit(LiveEvent::Note {
             text: "fresh session (--continue suppressed for this turn)".into(),
         });