Adds the missing pieces the wizard needed and the sidebar controls
around it:
- LoopsWizard is now a 6-step flow (identity → repo → task/topology
→ triggers → repeat → assign agents) plus the existing secrets
card. ResearchWizard picks up the same repo step and a hard gate
when the workspace has zero agents.
- New LoopStaffingStep with three tabs — Individual / Team /
Organization — that mix freely per loop; selections persist via
new loop_agents / loop_teams / loop_orgs join tables (0035
migration), each cascading on loop_id so hard-delete stays a
single-row DELETE.
- Backend CreateLoopRequest / UpdateLoopRequest accept the three
lists and apply_staffing does a transactional replace-all;
list_loops / get_loop hydrate the lists via a flattened
LoopWithStaffing response.
- LoopsList sidebar gains per-row enable/disable, edit (reopens the
wizard prefilled with the current loop, PATCHes on submit), and
delete with an inline confirm.
- NoAgentsGate blocks launching a loop or research topic from a
workspace with no roster; the sidebar `+` buttons also disable
with a tooltip pointing at the TEAM tier.
Not yet wired: the run driver still fills role slots from the
workspace-wide pool; teaching enqueue_iteration to prefer
loop_agents/loop_teams/loop_orgs is a follow-up.
