feat: modernize tooling to uv, ruff, ty, and dependency-groups

[jlaportebot]

Summary

Modernizes the dotfile-sync project tooling to use modern Python standards:

Changes

• Build backend: Switch from setuptools to hatchling
• Python version: Update requires-python from >=3.9 to >=3.11
• Type checking: Replace mypy with ty (faster, from Astral team)
• Dependency management: Migrate from to (PEP 735)
• Linting/formatting: Enhanced ruff configuration with more rules and per-file ignores for tests
• CI/CD: Complete rewrite using uv with separate lint, test, typecheck, and build jobs
• Code quality: Fix mypy error in core.py, apply ruff auto-fixes (Path.open(), datetime.UTC)

CI Improvements

• Separate lint, test, typecheck, and build jobs for better parallelization
• Test matrix: Python 3.11, 3.12, 3.13 (dropped 3.9, 3.10)
• Uses astral-sh/setup-uv@v5 with caching enabled
• Coverage threshold: 70% (current: 79%)
• Build verification step

Code Changes

• : Added for type safety, replaced with , with
• All ruff linting rules pass
• All ty type checks pass
• All 47 tests pass

Testing

============================= test session starts ==============================
platform linux -- Python 3.14.4, pytest-9.1.0, pluggy-1.6.0 -- /home/john/dotfile-sync/.venv/bin/python3
cachedir: .pytest_cache
rootdir: /home/john/dotfile-sync
configfile: pyproject.toml
testpaths: tests
plugins: cov-7.1.0
collecting ... collected 47 items

tests/test_cli.py::TestCLIVersion::test_version PASSED [ 2%]
tests/test_cli.py::TestCLIHelp::test_main_help PASSED [ 4%]
tests/test_cli.py::TestCLIHelp::test_init_help PASSED [ 6%]
tests/test_cli.py::TestCLIHelp::test_track_help PASSED [ 8%]
tests/test_cli.py::TestCLIHelp::test_backup_help PASSED [ 10%]
tests/test_cli.py::TestCLIHelp::test_restore_help PASSED [ 12%]
tests/test_cli.py::TestCLIHelp::test_untrack_help PASSED [ 14%]
tests/test_cli.py::TestCLIHelp::test_diff_help PASSED [ 17%]
tests/test_cli.py::TestCLIHelp::test_status_help PASSED [ 19%]
tests/test_cli.py::TestCLIHelp::test_push_help PASSED [ 21%]
tests/test_cli.py::TestCLIHelp::test_pull_help PASSED [ 23%]
tests/test_core.py::TestManifest::test_empty_manifest PASSED [ 25%]
tests/test_core.py::TestManifest::test_add_file PASSED [ 27%]
tests/test_core.py::TestManifest::test_add_duplicate_is_noop PASSED [ 29%]
tests/test_core.py::TestManifest::test_remove_file PASSED [ 31%]
tests/test_core.py::TestManifest::test_remove_nonexistent PASSED [ 34%]
tests/test_core.py::TestManifest::test_is_tracked PASSED [ 36%]
tests/test_core.py::TestManifest::test_save_and_reload PASSED [ 38%]
tests/test_core.py::TestInit::test_init_creates_repo PASSED [ 40%]
tests/test_core.py::TestInit::test_init_idempotent PASSED [ 42%]
tests/test_core.py::TestInit::test_init_with_remote PASSED [ 44%]
tests/test_core.py::TestTrack::test_track_single_file PASSED [ 46%]
tests/test_core.py::TestTrack::test_track_already_tracked PASSED [ 48%]
tests/test_core.py::TestTrack::test_track_directory PASSED [ 51%]
tests/test_core.py::TestTrack::test_track_nonexistent_path PASSED [ 53%]
tests/test_core.py::TestUntrack::test_untrack_file PASSED [ 55%]
tests/test_core.py::TestUntrack::test_untrack_not_tracked PASSED [ 57%]
tests/test_core.py::TestUntrack::test_untrack_directory PASSED [ 59%]
tests/test_core.py::TestBackup::test_backup_copies_files PASSED [ 61%]
tests/test_core.py::TestBackup::test_backup_with_message PASSED [ 63%]
tests/test_core.py::TestBackup::test_backup_no_tracked_files PASSED [ 65%]
tests/test_core.py::TestBackup::test_backup_file_content_preserved PASSED [ 68%]
tests/test_core.py::TestRestore::test_restore_copies_files PASSED [ 70%]
tests/test_core.py::TestRestore::test_restore_single_file PASSED [ 72%]
tests/test_core.py::TestRestore::test_restore_no_manifest PASSED [ 74%]
tests/test_core.py::TestDiff::test_diff_no_changes PASSED [ 76%]
tests/test_core.py::TestDiff::test_diff_with_modification PASSED [ 78%]
tests/test_core.py::TestDiff::test_diff_new_file PASSED [ 80%]
tests/test_core.py::TestDiff::test_diff_deleted_file PASSED [ 82%]
tests/test_core.py::TestListTracked::test_list_tracked_files PASSED [ 85%]
tests/test_core.py::TestListTracked::test_list_no_files PASSED [ 87%]
tests/test_core.py::TestEncodeRepoPath::test_encode_dotfile PASSED [ 89%]
tests/test_core.py::TestEncodeRepoPath::test_encode_nested_dotfile PASSED [ 91%]
tests/test_core.py::TestEncodeRepoPath::test_encode_no_dot PASSED [ 93%]
tests/test_core.py::TestEncodeRepoPath::test_encode_multiple_dots PASSED [ 95%]
tests/test_core.py::TestNotInitialized::test_track_without_init PASSED [ 97%]
tests/test_core.py::TestNotInitialized::test_backup_without_init PASSED [100%]

================================ tests coverage ================================
_______________ coverage: platform linux, python 3.14.4-final-0 ________________

Name Stmts Miss Cover Missing

dotfile_sync/init.py 1 0 100%
dotfile_sync/cli.py 92 39 58% 23-30, 47-49, 57-59, 67-69, 76-78, 86-88, 96-98, 105-107, 114-116, 123-125, 132-134, 138
dotfile_sync/core.py 228 28 88% 207, 237-238, 246, 255, 263, 282, 288, 312-322, 326-338, 359-366

TOTAL 321 67 79%
Required test coverage of 70% reached. Total coverage: 79.13%
============================== 47 passed in 1.13s ==============================
All checks passed!
8 files already formatted
All checks passed!
dotfile-sync, version 1.0.0

All commands pass locally.