Document improvement ideas for role fixtures (seed)

Enumerate improvement ideas for the role fixture (seed) mechanism in a document. The goal is to prevent RBAC-related data from being missing in seeded environments and to make such omissions easy to detect and verify. This task only produces the idea document; implementation issues will be created separately.

JIRA Issue: BA-7117

No file or test is named. Start by locating the role fixture (seed) mechanism and reviewing how RBAC data is represented and loaded in seeded environments; document improvement ideas that prevent omissions and make them easy to detect and verify. Done means the idea document is complete, with implementation work left to separate issues.

Written by the indexing model from the issue text.