Apply ruff format and document lint/type tooling in CLAUDE.md

First repo-wide ruff format pass, plus a note in CLAUDE.md to run
ruff and ty periodically.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

giant/sample.py

@@ -43,11 +43,9 @@ def sample_ddpm(
         alpha = schedule.alphas[i]
         alpha_bar = schedule.alpha_bars[i]
         z = torch.randn_like(x) if i > 0 else torch.zeros_like(x)
-        x = (
-            (1.0 / alpha.sqrt())
-            * (x - (1.0 - alpha) / (1.0 - alpha_bar).sqrt() * eps_pred)
-            + beta.sqrt() * z
-        )
+        x = (1.0 / alpha.sqrt()) * (
+            x - (1.0 - alpha) / (1.0 - alpha_bar).sqrt() * eps_pred
+        ) + beta.sqrt() * z
     return x