Initial commit: DeltaGlider - 99.9% compression for S3 storage

DeltaGlider reduces storage costs by storing only binary deltas between
similar files. Achieves 99.9% compression for versioned artifacts.

Key features:
- Intelligent file type detection (delta for archives, direct for others)
- Drop-in S3 replacement with automatic compression
- SHA256 integrity verification on every operation
- Clean hexagonal architecture
- Full test coverage
- Production tested with 200K+ files

Case study: ReadOnlyREST reduced 4TB to 5GB (99.9% compression)

pyproject.toml

@@ -0,0 +1,151 @@
+[project]
+name = "deltaglider"
+version = "0.1.0"
+description = "Store 4TB in 5GB: S3-compatible storage with 99.9% compression for versioned files"
+authors = [
+    {name = "Beshu Tech", email = "info@beshu.tech"},
+]
+maintainers = [
+    {name = "Beshu Tech Team", email = "support@beshu.tech"},
+]
+readme = "README.md"
+license = {text = "MIT"}
+requires-python = ">=3.11"
+keywords = [
+    "s3",
+    "compression",
+    "delta",
+    "storage",
+    "backup",
+    "deduplication",
+    "xdelta3",
+    "binary-diff",
+    "artifact-storage",
+    "version-control",
+    "minio",
+    "aws",
+    "cost-optimization",
+    "devops",
+]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "Intended Audience :: System Administrators",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: System :: Archiving :: Backup",
+    "Topic :: System :: Archiving :: Compression",
+    "Topic :: System :: Filesystems",
+    "Topic :: Internet",
+    "Environment :: Console",
+]
+
+dependencies = [
+    "boto3>=1.35.0",
+    "click>=8.1.0",
+    "python-dateutil>=2.9.0",
+]
+
+[project.urls]
+Homepage = "https://github.com/beshu-tech/deltaglider"
+Documentation = "https://github.com/beshu-tech/deltaglider#readme"
+Repository = "https://github.com/beshu-tech/deltaglider"
+Issues = "https://github.com/beshu-tech/deltaglider/issues"
+Changelog = "https://github.com/beshu-tech/deltaglider/releases"
+"Case Study" = "https://github.com/beshu-tech/deltaglider/blob/main/docs/case-study-readonlyrest.md"
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0.0",
+    "pytest-mock>=3.14.0",
+    "pytest-asyncio>=0.24.0",
+    "moto[s3]>=5.0.0",
+    "ruff>=0.8.0",
+    "mypy>=1.13.0",
+    "boto3-stubs[s3]>=1.35.0",
+    "types-python-dateutil>=2.9.0",
+]
+
+[project.scripts]
+deltaglider = "deltaglider.app.cli.main:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/deltaglider"]
+
+[tool.hatch.build.targets.sdist]
+include = [
+    "/src",
+    "/tests",
+    "/docs",
+    "README.md",
+    "LICENSE",
+    "CONTRIBUTING.md",
+    "pyproject.toml",
+]
+exclude = [
+    "*.pyc",
+    "__pycache__",
+    ".git",
+    ".pytest_cache",
+    "*.delta",
+    "reference.bin",
+    "1.66.1/",
+]
+
+[tool.uv]
+dev-dependencies = [
+    "pytest>=8.0.0",
+    "pytest-mock>=3.14.0",
+    "pytest-asyncio>=0.24.0",
+    "moto[s3]>=5.0.0",
+    "ruff>=0.8.0",
+    "mypy>=1.13.0",
+    "boto3-stubs[s3]>=1.35.0",
+    "types-python-dateutil>=2.9.0",
+]
+
+[tool.ruff]
+target-version = "py311"
+line-length = 100
+select = [
+    "E",   # pycodestyle errors
+    "W",   # pycodestyle warnings
+    "F",   # pyflakes
+    "I",   # isort
+    "B",   # flake8-bugbear
+    "UP",  # pyupgrade
+]
+ignore = ["E501"]  # line too long
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
+
+[tool.mypy]
+python_version = "3.11"
+warn_return_any = true
+warn_unused_configs = true
+disallow_untyped_defs = true
+disallow_any_unimported = false
+no_implicit_optional = true
+check_untyped_defs = true
+namespace_packages = true
+explicit_package_bases = true
+
+[tool.pytest.ini_options]
+minversion = "8.0"
+testpaths = ["tests"]
+markers = [
+    "e2e: end-to-end tests requiring LocalStack",
+    "integration: integration tests",
+    "unit: unit tests",
+]