table.get() now accepts column=value keyword arguments and returns the
first matching row, so a row can be fetched by a unique column rather
than only by its primary key. Passing both a primary key and keyword
arguments raises ValueError, and calling get() with neither raises
TypeError.
Refs #588
* Automated upgrades by Ruff
uvx --with 'ruff>=0.16.0' ruff check . --fix --unsafe-fixes
* Fix remaining Ruff errors with GPT-5.6 Sol high
https://gist.github.com/simonw/6da7906a9fea6e90da131c21a9055199
* Fix flake E501 long lines
* New Protocol for migrations to make ty happy
* create_table now handles compound primary keys
* CLI now accepts multiple --pk for compound primary keys
* Docs for compound primary keys with CLI and Python library
* New .get() method plus documentation
Closes#36, closes#39
