Initial release: E1 genus probe package moved out of the E01 workflow

- src/custom_models torch modules, store, training, metrics, runner and CLI
  (package-relative imports for pip installability)
- test suite (49 tests) + conftest with fast synthetic-store fixtures
- uv-managed dev env (pyproject + CPU torch index), hatchling build
- README: uv for the package, pip install into conda envs for the workflow

.gitignore

@@ -0,0 +1,10 @@
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/
+dist/
+build/
+.pytest_cache/
+.ruff_cache/
+.coverage
+htmlcov/