Release: statscore meta-crate, mdBook docs, PyPI 1.0

[armanrasta]

Summary

Production release packaging — not where Python bindings are built (those ship per-phase). This tracks the 1.0 polish.

Meta-crate (statscore)

• Re-export all public crates behind feature flags
• Publish to crates.io

Documentation

• mdBook user guide (docs/)
• All doc-tests pass
• Math formulas in LaTeX in doc comments

Python 1.0

• Full API coverage across all modules
• pip install statscore on Linux, macOS, Windows
• Published on PyPI
• Sphinx or mkdocs API reference

Benchmarks

• criterion benches: ≥2× SciPy on batch ops
• benches/ workspace-level benchmarks

Done when

• crates.io 1.0.0 + PyPI 1.0.0 published
• Zero valgrind leaks in Python extension