Rationale, pros and cons: https://docs.google.com/document/d/1TuJ8Z4W9rr1vUuKQ0O3Vh5dPPnGw5dKizylaEPtiPcg

I suggest having questions and discussions about implementation details in this Google doc and higher level discussions here. Whatever works.

Related:

• Continuous Integration with multiple git repos? (using west or similar) zephyrproject-rtos/zephyr#34713
• Transfer rimage git history to subdirectory tools/rimage/ in the sof git repo #8297