ci: pin black and ruff to exact versions; format for black 26.x

.github/workflows/ci.yml

@@ -60,7 +60,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
-      - run: pip install black
+      - run: pip install "black==26.5.1"
       - run: black --check RiskLabAI test
 
   lint:
@@ -71,5 +71,5 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
-      - run: pip install ruff
+      - run: pip install "ruff==0.15.17"
       - run: ruff check RiskLabAI test

RiskLabAI/ensemble/bagging_classifier_accuracy.py

@@ -4,6 +4,7 @@
 as described in "Advances in Financial Machine Learning" by de Prado (2018),
 Chapter 6, Section 6.2, p. 86.
 """
+
 # import numpy as np  <-- Removed unused import
 from scipy.stats import binom
 

pyproject.toml

@@ -61,6 +61,9 @@ dev = [
     "torchvision", # Often needed with torch
     "torchaudio",  # Often needed with torch
     "pytest",
+    # Linters pinned to match CI exactly (.github/workflows/ci.yml).
+    "black==26.5.1",
+    "ruff==0.15.17",
 ]
 all = [
     "RiskLabAI[pde]",