- Fix indentation for Build package step
- Fix indentation for Publish to TestPyPI step
- Fix indentation for Publish to PyPI step

- Add pytest-xdist dependency for parallel test execution
- Add parallel test tasks for installed, script, and zipapp modes
- Add test:parallel task to run all modes in parallel
- Add test:fast tasks for quick parallel runs (skipping slow tests)
- Update check:fix and check tasks to use parallel execution by default
- Update Python version test tasks to use parallel execution
- Add pytest.ini comments explaining parallel execution options

- Add pytest-xdist dependency for parallel test execution
- Add parallel test tasks for installed, script, and zipapp modes
- Add test:parallel task to run all modes in parallel
- Add test:fast tasks for quick parallel runs (skipping slow tests)
- Update check:fix and check tasks to use parallel execution by default
- Update Python version test tasks to use parallel execution
- Fix zipapp deterministic test to work in parallel using temp directories
- Move zipapp build tests to separate files with __runtime_mode__ = 'zipapp'
- Update pytest.ini comments explaining parallel execution options
- Remove skipif markers in favor of conftest runtime mode filtering

- Update GitHub workflows for publishing and releases
- Update .gitignore and build configuration (.serger.jsonc)
- Remove bin/serger.py (generated file)
- Add dev scripts: install_pre_commit_hooks.sh, pyright-quiet.sh
- Remove dev scripts: list-project.sh, sync_ai_guidance.py
- Update project dependencies (pyproject.toml, poetry.lock)
- Update pytest configuration
- Refactor core schema validation and type checking modules
- Update all test files for new structure
- Update documentation (contributing, installation, decisions)