Never-interacted remote bots painted as bare handles because roster rows
carried only profile names: display_name/title/ui_meta/has_avatar were
fetched lazily on first interaction (#91365). Thread credential-free
profile metadata from the enumeration-time /api/profiles body through
enumerateRegistryAgentSources (main.ts) and buildAgentRoster
(connection-registry.ts), keeping it attached to the connection-qualified
row across the same-install collapse. The plugin.js botRosterMeta half of
the original PR is dropped — superseded by landed #92731.
Fixes#91365
Salvaged (partial) from #92708.
