Apply ruff format across the codebase

Whitespace-only reflow (line wrapping, blank lines between defs); no
logic changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

giant/sample.py

@@ -63,8 +63,8 @@ def sample_secondaries(
     sec_cont = x_slots[:, :, :4]
     sec_type_emb = x_slots[:, :, 4:]
 
-    sec_valid = (
-        torch.arange(K_MAX, device=device).unsqueeze(0) < n_sec_pred.unsqueeze(1)
+    sec_valid = torch.arange(K_MAX, device=device).unsqueeze(0) < n_sec_pred.unsqueeze(
+        1
     )
     return sec_cont, sec_type_emb, sec_valid