python: publish as voltic on PyPI (name jackal was taken)

Author: RyanJamesStewart

README.md

@@ -175,15 +175,21 @@ cargo test reference_table -- --nocapture
 
 ## Python
 
-A PyO3 wrapper (`python/jackal_py.rs`, ~50 lines) builds with `maturin`:
+A PyO3 wrapper (`python/jackal_py.rs`, ~50 lines) is published on PyPI as `voltic` (the name `jackal` was taken):
+
+```sh
+pip install voltic
+python -c "import voltic; print(voltic.implied_vol([100.0],[100.0],[1.0],[0.02],[12.82158],['c']))"
+```
+
+To build it from source:
 
 ```sh
 rustup override set nightly      # in this directory; the core uses std::simd
 maturin develop --release        # uses the `python` feature
-python -c "import jackal; print(jackal.implied_vol([100.0],[100.0],[1.0],[0.02],[12.82158],['c']))"
 ```
 
-It exposes the one function. It exists as a signal that the kernel ships as a Python extension if you want it; not because the repo expects `pip install` traffic.
+It exposes the one function. The wrapper is list-based for portability; a real release would take `&[f64]` views via `numpy::PyReadonlyArray1`.
 
 ## License
 

pyproject.toml

@@ -3,7 +3,7 @@ requires = ["maturin>=1.5,<2"]
 build-backend = "maturin"
 
 [project]
-name = "jackal"
+name = "voltic"
 description = "Vectorized Black-Scholes implied-volatility solver."
 requires-python = ">=3.9"
 license = { text = "MIT OR Apache-2.0" }

python/jackal_py.rs

@@ -56,7 +56,7 @@ fn implied_vol_py(
 }
 
 #[pymodule]
-fn jackal(m: &Bound<'_, PyModule>) -> PyResult<()> {
+fn voltic(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(implied_vol_py, m)?)?;
     // touch PyList so the import is not flagged unused on older pyo3
     let _ = std::any::type_name::<PyList>();