Initial pi0.7 minimal validation

src/pi07mini/runtime.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+import json,random
+from pathlib import Path
+import numpy as np,torch,yaml
+def load_config(path):
+    with Path(path).open() as f:return yaml.safe_load(f)
+def seed_everything(seed:int):random.seed(seed);np.random.seed(seed);torch.manual_seed(seed)
+def choose_device(name="auto"):
+    if name!="auto":return torch.device(name)
+    if torch.cuda.is_available():return torch.device("cuda")
+    if torch.backends.mps.is_available():return torch.device("mps")
+    return torch.device("cpu")
+def write_json(path,value):
+    p=Path(path);p.parent.mkdir(parents=True,exist_ok=True);p.write_text(json.dumps(value,indent=2,ensure_ascii=False))