Default #src is misconfigured

[ef4]

The blueprint is confused about the purpose of #src. If you only ever use it in tests, it works, because there it's always supposed to actually mean the (unbuilt) src directory.

But if you mention #src in published code, the build incorrectly leaves it alone and points the actual consuming app at src instead of dist.

This is probably the root cause of #138 too.

#src is not a solution to the problem of built and unbuilt being different. I continue to think we should use a custom export condition instead.

[NullVoxPopuli]

in a previous tooling meeting, we discussed adding a resolver plugin to @embroider/addon-dev that would resolve anything in #src so that we can use it in actual library code

[ef4]

That would solve the bug.