feat: initialize standalone image-filter

Rename the distribution to image-filter and imports to image_filter.
Keep medical fixtures local and document their setup for fresh clones.
Include composite pipelines, consistent examples, and class diagrams.

pyproject.toml

@@ -0,0 +1,35 @@
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "image-filter"
+version = "0.1.0"
+description = "Typed, application-independent scientific image filtering pipelines"
+readme = "README.md"
+requires-python = ">=3.10"
+license = { text = "Proprietary" }
+authors = [{ name = "Radiuma contributors" }]
+dependencies = [
+  "numpy>=1.24",
+  "scipy>=1.10",
+  "scikit-image>=0.21",
+  "PyWavelets>=1.4",
+]
+
+[project.optional-dependencies]
+test = ["pytest>=8", "nibabel>=5", "matplotlib>=3.7"]
+examples = ["nibabel>=5", "matplotlib>=3.7", "pydicom>=3", "SimpleITK>=2.3", "pynrrd>=1.0"]
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools.package-data]
+image_filter = ["py.typed"]
+
+[tool.pytest.ini_options]
+addopts = "-ra --strict-markers"
+testpaths = ["tests"]
+markers = [
+  "real_data: tests which load non-generated image data",
+]