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

pyproject.toml

@@ -0,0 +1,61 @@
+[build-system]
+requires = ["hatchling>=1.25"]
+build-backend = "hatchling.build"
+
+[project]
+name = "custom-models"
+version = "0.1.0"
+description = "E1 genus probe: torch models and train/validate/test wrapper"
+readme = "README.md"
+requires-python = ">=3.11"
+license = { text = "MIT" }
+authors = [{ name = "Tom Kasper" }]
+dependencies = [
+    "numpy>=2.0,<3",
+    "polars>=1.0",
+    "torch>=2.6",
+]
+
+[project.optional-dependencies]
+pod5 = ["pod5"]
+dev = ["pytest>=8", "ruff>=0.8", "pod5"]
+
+[project.scripts]
+custom-models = "custom_models.cli:main"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/custom_models"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-q"
+
+[tool.ruff]
+line-length = 100
+src = ["src", "tests"]
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "D", "B", "RUF", "TRY", "I"]
+ignore = [
+    "TRY003", # long messages are the run-artifact contract here
+    "TRY004", # ValueError (not TypeError) on config/type misuse: deliberate
+    "TRY300",
+    "B905",   # explicit strict in zip() is noisy for internal iteration
+]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/*" = ["D103", "D401"]
+
+# UV: dev/build environment resolves torch from the CPU wheel index so the
+# venv stays small. pip installs into the workflow's conda envs ignore this
+# (torch comes from conda there and satisfies the requirement).
+[tool.uv]
+index-strategy = "unsafe-best-match"
+
+[[tool.uv.index]]
+name = "pytorch-cpu"
+url = "https://download.pytorch.org/whl/cpu"
+explicit = true
+
+[tool.uv.sources]
+torch = { index = "pytorch-cpu" }