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)

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+*.egg
+*.egg-info/
+dist/
+build/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.manifest
+*.spec
+
+# Virtual environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# UV
+.uv/
+uv.lock
+
+# Testing
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Project specific
+*.delta
+reference.bin
+/cache/
+.deltaglider-cache/
+
+# Test data
+1.66.1/
+test_*.txt
+test_*.zip
+*.dmg
+*.tar.gz
+app_*.zip
+binary_*.exe
+config_*.json
+content_*/
+recovered_*.zip
+
+# MinIO/S3 test files
+/tmp/
+/test-data/
+
+# Documentation builds
+docs/_build/
+docs/_static/
+docs/_templates/
+
+# Logs
+*.log