Generator A emits a type that generator B wants to inspect. What is safe for ordinary sou…

Generator A emits a type that generator B wants to inspect. What is safe for ordinary source-generator output?

1. Give both generators a shared declared input or combine the phases in one supported pipeline.
2. Name generator A first in the project file.
3. Add a delay before generator B reads the compilation.
4. Use `Collect()` so generator B waits for generator A.