Single-customer projects, but content is addable whenever ONE of its customers
is the project's customer (not only when the first lineage customer equals it):
- linkDealToProject: collect ALL customers across the deal's quote/contract/
invoice lineage and reject only when none is the project's customer. Mirrors
the events path, where a multi-customer event already attaches if any of its
customers matches. Adoption onto an empty project unchanged.
- assignDocument: a document carries one customer, so equality stays correct;
message aligned with the lineage check.
Luca
f74d8d4e8c