fix(lint): UP038 isinstance tuple wrappers + codespell matric whitelist

- src/audit_chain.py: isinstance(v, (np.integer,)) -> isinstance(v, np.integer)
  same for np.floating. Single-element tuples are semantically equivalent
  but ruff UP038 prefers the bare type for readability.
- .pre-commit-config.yaml: add "matric" to codespell -L list. "matric
  potential" is a real soil-physics term used in the Philip-de Vries
  formulation, not a typo of metric/matrix.

Author: felipearocha

.pre-commit-config.yaml

@@ -29,7 +29,7 @@ repos:
     rev: v2.3.0
     hooks:
       - id: codespell
-        args: ["-L", "ans,nd,te,thi,fro,ot"]
+        args: ["-L", "ans,nd,te,thi,fro,ot,matric"]   # "matric potential" is a real term in unsaturated porous-media physics
         exclude: "^(assets|notebooks|week9_brief_latex\\.html)/"
 
 ci:

src/audit_chain.py

@@ -42,9 +42,9 @@ def _s(d):
             for k, v in d.items():
                 if isinstance(v, np.ndarray):
                     out[k] = v.tolist()
-                elif isinstance(v, (np.integer,)):
+                elif isinstance(v, np.integer):
                     out[k] = int(v)
-                elif isinstance(v, (np.floating,)):
+                elif isinstance(v, np.floating):
                     out[k] = float(v)
                 elif isinstance(v, dict):
                     out[k] = _s(v)