node kit: alpha flag through train/eval, carry env+width fixes, bootstrap script

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/eval_loop_code.py

@@ -74,6 +74,7 @@ def main():
                     help="no-recurrence control arm: adapter(e,e) once")
     ap.add_argument("--pause", type=int, default=0,
                     help="append p pause tokens to each prompt")
+    ap.add_argument("--alpha", type=float, default=0.3)
     args = ap.parse_args()
     ks = [int(x) for x in args.ks.split(",")]
 
@@ -81,7 +82,8 @@ def main():
     tok.padding_side = "left"
     looper = BandLooper(model)
     adapter = MergeAdapter(
-        d=model.config.get_text_config().hidden_size).cuda()
+        d=model.config.get_text_config().hidden_size,
+        alpha=args.alpha).cuda()
     if args.adapter:
         adapter.load_state_dict(torch.load(args.adapter, map_location="cuda"))
         adapter.eval()