XQDB 0.1.0

First public XQDB release.\n\n- High-performance Rust q IPC core\n- Python bindings with Narwhals and Arrow C Stream exchange for PyArrow, pandas, and Polars\n- TypeScript/Node.js bindings with Apache Arrow tables\n- setuptools-rust Python builds with a CPython 3.10+ ABI3 wheel contract\n- Live q validation and cross-language benchmark harnesses\n\nThis source release preserves the upstream BSD-3-Clause attribution. Registry publication remains separately gated through the manual release workflow.