chore(gitignore): use GitHub Python template as base

Replace the minimal .gitignore with GitHub's official Python .gitignore
template and append fromager's project-specific patterns in a clearly
labeled section.

This improves coverage from ~5 to all 12+ recommended language-specific
patterns, adding protection for compiled bytecode, C extensions, editor
files, environment files, and many Python tooling artifacts.

Closes: #966

Co-Authored-By: Claude <claude@anthropic.com>
Signed-off-by: smoparth <smoparth@redhat.com>

Author: 2 people

.gitignore

@@ -1,26 +1,243 @@
+# Byte-compiled / optimized / DLL files
 __pycache__/
-.*.log
+*.py[codz]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#   Usually these files are written by a python script from a template
+#   before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py.cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+# Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+# uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+# poetry.lock
+# poetry.toml
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#   pdm recommends including project-wide configuration in pdm.toml, but excluding .pdm-python.
+#   https://pdm-project.org/en/latest/usage/project/#working-with-version-control
+# pdm.lock
+# pdm.toml
+.pdm-python
+.pdm-build/
+
+# pixi
+#   Similar to Pipfile.lock, it is generally recommended to include pixi.lock in version control.
+# pixi.lock
+#   Pixi creates a virtual environment in the .pixi directory, just like venv module creates one
+#   in the .venv directory. It is recommended not to include this directory in version control.
+.pixi
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# Redis
+*.rdb
+*.aof
+*.pid
+
+# RabbitMQ
+mnesia/
+rabbitmq/
+rabbitmq-data/
+
+# ActiveMQ
+activemq-data/
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.envrc
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+.idea/
+
+# Abstra
+.abstra/
+
+# Visual Studio Code
+.vscode/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
+# Marimo
+marimo/_static/
+marimo/_lsp/
+__marimo__/
+
+# Streamlit
+.streamlit/secrets.toml
+
+# Editor swap/temp files
+*.swp
+*.swo
+*~
+
+# -----------------------------------------------------------
+# Fromager project-specific
+# -----------------------------------------------------------
+
+# Build artifacts and working directories
 /sdists-repo/
 /wheels-repo/
 /work-dir*/
+/build-logs/
+/e2e-output/
+/artifacts
+/overrides/
+
+# Test and virtual environments
 /test-venv/
 /venv*/
-/.venv/
-/build/
-**/*.egg-info/
+
+# Generated version file
 /src/fromager/version.py
-/.coverage
-.coverage.*
-/artifacts
-/build-logs/
-/.pypirc
-.pytest_cache/
+
+# Hatch build tool
 /.hatch/
+
+# Node.js (used by some dev tooling)
 /node_modules/
 /package-lock.json
 /package.json
-/e2e-output/
-/dist/
+
+# e2e test build outputs
 /e2e/flit_core_override/build
 /e2e/fromager_hooks/build
 /e2e/fromager_hooks/dist
@@ -29,11 +246,11 @@ __pycache__/
 /e2e/pyo3_test/dist
 /e2e/pyo3_test/target
 /e2e/pyo3_test/vendor
-/overrides/
-/docs/_build/
+
+# Documentation build output
 /docs/example/bootstrap-output
 
-/.mypy_cache/
+# Misc
 .skip-coverage
 .claude
 /.beads/