* feat(hub): guide setup with provider IDs
* fix(hub): preserve login setup state
* feat(hub): select starter agent runtime
Use the connected daemon's provider snapshot so generated Hub bundles only
contain complete provider, model, and mode combinations.
* fix(hub): stage starter runtime choices
Keep providers with valid modes selectable when the daemon has no default mode, so users explicitly choose the complete runtime.
* fix(hub): scope runtime choices to workspace
Provider capabilities can vary by repository, so request the snapshot for the bundle directory that guided setup will deploy.
