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

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

scripts/train_carry.py

@@ -8,6 +8,7 @@ Curriculum: easy p=2, hard p=6 (hard needs the longer latent chain).
 
 import argparse
 import json
+import os
 import math
 import random
 import sys
@@ -23,7 +24,8 @@ from loop_common import BandLooper, MergeAdapter, chat_prompt, DIRECT_SUFFIX
 sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
 from jlens.core import load_model  # noqa: E402
 
-OUT = Path(__file__).resolve().parent.parent / "results-loop"
+OUT = Path(os.environ.get("LOOP_OUT",
+    Path(__file__).resolve().parent.parent / "results-loop"))
 STEPS = 600
 BATCH = 4
 LR = 1e-3
@@ -93,7 +95,8 @@ def main():
     for pp in model.parameters():
         pp.requires_grad_(False)
     looper = BandLooper(model)
-    adapter = MergeAdapter().cuda()
+    adapter = MergeAdapter(
+        d=model.config.get_text_config().hidden_size).cuda()
     opt = torch.optim.AdamW(adapter.parameters(), lr=LR, weight_decay=0.01)
 
     keep = [it for it in data