chore(ci): pin ruff 0.15.5 and add pre-commit hooks

Pin CI ruff to match pyproject.toml expectations and add a minimal
pre-commit config (ruff-format + ruff --fix) so local runs match CI.

Author: vlad-scherbich

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           python-version: "3.11"
       - name: Install ruff
-        run: pip install --no-cache-dir ruff
+        run: pip install --no-cache-dir ruff==0.15.5
       - name: Run ruff format check
         run: ruff format --check .
       - name: Run ruff lint check

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+# Lightweight Python formatting/lint for scenario workloads. Matches the ruff job in ci.yml.
+# Install: pip install pre-commit && pre-commit install
+repos:
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.5
+    hooks:
+      - id: ruff-format
+      - id: ruff
+        args: [--fix]