Need a better way to find the `short name` of a package

[steve-downey]

Running check [Requirement][directory.tests] ...
[error          ][directory.tests          ]: The directory '/home/sdowney/src/Optional26/beman-tidy/tests/beman/beman-tidy' does not exist.                                                                                                                              [error          ][directory.tests          ]: Please manually move test files to the tests/beman/<short_name> directory. See https://github.com/bemanproject/beman/blob/main/docs/beman_standard.md#directorytests for more information.

Optional26 was the ancient name for the package, it remaining is because cmake emits full paths and I haven't got around to changing it.

beman-tidy however is the branch I'm working on to make optional pass the beman-tidy tests.

We shouldn't assume that the local path name for a checkout is the name of the project under beman, nor should we assume that the short name is identical to the project name, as that is over-coupling.

We may need some additional metadata stashed somewhere, or reuse the names under include or src ?

[steve-downey]

I am guessing this was also why I got this change:

-# beman.optional: C++26 Extensions for std::optional
+# beman.beman-tidy: TODO Short Description