ci: Add DevOps quality assurance with pre-commit hooks and GitHub Actions

- Add pre-commit hooks: Ruff lint/format, Bandit security scan, YAML/TOML validation
- Add GitHub Actions CI workflow: lint, security, test, and build jobs
- Configure Ruff and Bandit in pyproject.toml
- Add pytest test suite for build_epub.py (25 tests)
- Fix code issues: exception chaining, httpx timeout, formatting
- Add requirements.txt and requirements-dev.txt

.pre-commit-config.yaml

@@ -0,0 +1,54 @@
+# Pre-commit hooks for claude-howto project
+# Run `pre-commit install` to set up hooks
+# Run `pre-commit run --all-files` to check all files
+
+default_language_version:
+  python: python3.11
+
+repos:
+  # Ruff - Fast Python linter and formatter
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.8.2
+    hooks:
+      # Ruff linter
+      - id: ruff
+        name: ruff-lint
+        args: [--fix, --exit-non-zero-on-fix]
+        types_or: [python, pyi]
+        files: ^scripts/
+      # Ruff formatter (replaces black)
+      - id: ruff-format
+        name: ruff-format
+        types_or: [python, pyi]
+        files: ^scripts/
+
+  # Bandit - Security linter
+  - repo: https://github.com/PyCQA/bandit
+    rev: 1.7.10
+    hooks:
+      - id: bandit
+        name: bandit-security
+        args: [-c, pyproject.toml]
+        additional_dependencies: ["bandit[toml]"]
+        types: [python]
+        files: ^scripts/
+        exclude: ^scripts/tests/
+
+  # Standard pre-commit hooks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: check-yaml
+        name: check-yaml
+        args: [--allow-multiple-documents]
+      - id: check-toml
+        name: check-toml
+      - id: end-of-file-fixer
+        name: fix-end-of-file
+      - id: trailing-whitespace
+        name: fix-trailing-whitespace
+      - id: check-added-large-files
+        name: check-large-files
+        args: [--maxkb=1000]
+      - id: check-merge-conflict
+        name: check-merge-conflict