fix(appd): mark session Stopped when WEFT_RUNTIME_BIN is absent

Previously the supervisor returned Ok(()) without updating the session
state, leaving it in Starting indefinitely. Now it sets state to
Stopped, removes the abort sender, and broadcasts AppState:stopped
before returning, consistent with every other early-exit path.

crates/weft-appd/src/runtime.rs

@@ -134,6 +134,13 @@ pub(crate) async fn supervise(
         Ok(b) => b,
         Err(_) => {
             tracing::debug!(session_id, %app_id, "WEFT_RUNTIME_BIN not set; skipping process spawn");
+            let mut reg = registry.lock().await;
+            reg.set_state(session_id, AppStateKind::Stopped);
+            reg.remove_abort_sender(session_id);
+            let _ = reg.broadcast().send(Response::AppState {
+                session_id,
+                state: AppStateKind::Stopped,
+            });
             return Ok(());
         }
     };