Chroma, Exa, Nomic, and Qdrant now expose package `__version__` values
through package-local `_version.py` modules, matching the version-file
pattern used by the other partner packages. Each package also gets a
`check_version` target so release version drift between `pyproject.toml`
and runtime exports is caught consistently.
- Removes Codespell from deps, docs, and `Makefile`s
- Python version requirements in all `pyproject.toml` files now use the
`~=` (compatible release) specifier
- All dependency groups and main dependencies now use explicit lower and
upper bounds, reducing potential for breaking changes
