Add justfile for common development tasks

This commit adds a justfile that provides convenient shortcuts for common
development tasks in the Black Python Devs website repository.

The justfile includes commands for:
- install: Install dependencies using uv sync
- serve: Run the render-engine development server
- build: Build the static site
- test: Run pytest tests (with verbose and coverage variants)
- lint: Run ruff checks and format validation
- format: Format code using ruff
- pre-commit-run: Execute pre-commit hooks
- clean: Remove build artifacts and cache directories
- dev: Full development workflow (install, lint, test, build)

All commands properly use uv run to execute tools within the project's
virtual environment. This improves developer experience by providing
a consistent, discoverable interface for common tasks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: kjaymiller

justfile

@@ -0,0 +1,54 @@
+# Black Python Devs Website - Just recipes
+
+# Display all available commands
+help:
+    @just --list
+
+# Install dependencies
+install:
+    uv sync
+
+# Run development server
+serve:
+    uv run render-engine serve
+
+# Build static site
+build:
+    uv run --no-dev --prerelease=allow render-engine build
+
+# Run tests
+test:
+    uv run pytest
+
+# Run tests with verbose output
+test-verbose:
+    uv run pytest -v
+
+# Run tests and generate coverage
+test-coverage:
+    uv run pytest --cov
+
+# Run linting and formatting checks
+lint:
+    uv run ruff check .
+    uv run ruff format . --check
+
+# Format code
+format:
+    uv run ruff format .
+    uv run ruff check . --fix
+
+# Run pre-commit hooks
+pre-commit-run:
+    uv run pre-commit run --all-files
+
+# Clean build artifacts
+clean:
+    rm -rf output/
+    find . -type d -name __pycache__ -exec rm -rf {} + 2>/dev/null || true
+    find . -type d -name .pytest_cache -exec rm -rf {} + 2>/dev/null || true
+    find . -type d -name .ruff_cache -exec rm -rf {} + 2>/dev/null || true
+
+# Full development workflow (install, lint, test, build)
+dev: install lint test build
+    @echo "✓ Development workflow complete"