Every product module's backend app (Membership, School, Benefits,
Classifieds, Interac Payments) has its root menu restricted to its own
manager/coordinator group. A fresh tncsc_deployment install left the
admin user in none of them, so admin's app switcher only showed stock
apps (Events, eLearning, ...) - which looks exactly like the modules
weren't installed, even though ir.module.module.state is 'installed' for
all of them (menu visibility is group-based, not install-state-based).
Fixed by seeding admin into tncsc_deployment.group_tncsc_board_admin,
whose implied_ids already cover every product manager group - this
automates what Phase 8 previously described doing by hand for just the
School Coordinator group. Verified on a fresh install: admin's visible
root menus now include Membership/School/Benefits/Classifieds/Interac
Payments alongside the stock apps, tests still 9/9.
Also documents in HANDOFF.md that `user in group.user_ids` doesn't see
implied-group membership - use has_group() instead, which resolves the
transitive closure correctly.
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