🐛 Use the first app or function defined in the file in the typer command

[lenamonj]

The typer command picks "any Typer app" and "any function" by iterating a set of module names, so which one runs depends on the process hash seed. A file that defines zeta = typer.Typer() and then alpha = typer.Typer() runs alpha on five of eight PYTHONHASHSEED values and zeta on the other three. The docs promise "the first Typer app available in the file, with any name" and "the first function in the file".

This iterates the module's names in definition order instead, and the any-name function fallback accepts only functions defined in that file, so an imported callable such as pathlib.Path can no longer be picked.

Two new tests run each asset under eight hash seeds; both fail on master and pass with the change. scripts/test.sh (1382 passed) and scripts/lint.sh are clean.