A Claude Code assisted rewrite

.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+# Python files
+[*.py]
+max_line_length = 88
+quote_type = double
+
+# YAML files
+[*.{yml,yaml}]
+indent_size = 2
+
+# JSON files
+[*.json]
+indent_size = 2
+
+# TOML files
+[*.toml]
+indent_size = 4
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+max_line_length = 80
+
+# Makefile
+[Makefile]
+indent_style = tab
+
+# Shell scripts
+[*.sh]
+indent_size = 2
+
+# Git config files
+[.git*]
+indent_size = 2
+
+# Documentation
+[*.rst]
+indent_size = 3
+
+# Configuration files
+[*.{ini,cfg}]
+indent_size = 4

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+env:
+  PYTHON_VERSION: "3.11"
+
+jobs:
+  lint:
+    name: Lint & Type Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Cache pip packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools wheel build
+          pip install pytest pytest-cov pytest-mock black ruff mypy types-PyYAML types-tqdm hypothesis
+          pip install rich PyYAML holidays tqdm
+          pip install .
+
+      - name: Run Black
+        run: black --check src tests
+
+      - name: Run Ruff
+        run: ruff check src tests
+
+      - name: Run MyPy
+        run: mypy src
+
+  test:
+    name: Test Python ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        exclude:
+          - os: windows-latest
+            python-version: "3.8"
+          - os: macos-latest
+            python-version: "3.8"
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Cache pip packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('pyproject.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools wheel build
+          pip install pytest pytest-cov pytest-mock black ruff mypy types-PyYAML types-tqdm hypothesis
+          pip install rich PyYAML holidays tqdm
+          pip install .
+
+      - name: Run tests with coverage
+        run: |
+          pytest -v --cov --cov-report=xml --cov-report=term
+
+      - name: Upload coverage to Codecov
+        if: matrix.python-version == '3.11' && matrix.os == 'ubuntu-latest'
+        uses: codecov/codecov-action@v3
+        with:
+          file: ./coverage.xml
+          flags: unittests
+          name: codecov-umbrella
+          fail_ci_if_error: false
+
+  security:
+    name: Security Scan
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools wheel
+          pip install bandit[toml] safety
+          sudo apt-get update && sudo apt-get install -y jq
+
+      - name: Run Bandit security scan
+        run: |
+          # Run Bandit with our configured skips
+          bandit -r src -f json -o bandit-report.json -s B311,B404,B603,B607 || true
+          # Check if there are any high severity issues
+          if jq -e '.results | map(select(.issue_severity == "HIGH")) | length > 0' bandit-report.json > /dev/null 2>&1; then
+            echo "High severity security issues found"
+            exit 1
+          fi
+
+      - name: Check for known vulnerabilities
+        run: safety check --json
+
+  build:
+    name: Build Distribution
+    runs-on: ubuntu-latest
+    needs: [lint, test]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Install build dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install build twine
+
+      - name: Build package
+        run: python -m build
+
+      - name: Check distribution
+        run: twine check dist/*
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: dist
+          path: dist/