List active users in the authenticated caller's company with
optional filters: name/email search, department (exact
match), role (admin / employee), manager presence (managers /
without_manager), Bizy enrollment (bizy_enabled /
bizy_disabled), and allowance boost (budget_boosted).
Each row includes budget_boost (the persistent, recurring
"Allowance Boost" to that user's monthly giving allowance; 0
if none set). Returns paginated structured rows plus counts,
available departments, and the filters that were applied.
Pagination is cursor-based: pass page_size on the
first call and the returned next_cursor on subsequent
calls. Admin-only — gated on the same policy as the Bizy
chat UserAdmin agent.

Required OAuth scope: user:administer