user.bulkUpdateRoles({userIds, addRole?, removeRole?}) batches role
changes across up to 200 users with a SUPER_ADMIN self-demote guard.
When MENTOR is freshly added, fires sendMentorOnboardingEmail once per
user, gated by User.mentorOnboardingSentAt for idempotency. Audit log
entry per user changed.
UI: 'Add MENTOR role' button surfaces in the existing /admin/members
bulk-selection toolbar when ≥1 user is selected. Other roles
(OBSERVER / AWARD_MASTER) supported by the procedure but not yet wired
to UI; one button keeps the toolbar minimal until a clear need arises.
Tests cover happy path, idempotency on second call, removeRole semantics,
and the SUPER_ADMIN self-demote guard.
Plan: docs/superpowers/plans/2026-04-28-pr6-multi-role-and-workspace-previews.md
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