IRuntimeFellowshipView.GetMembers() gives the fellowship panel a way to
enumerate the whole roster (TryGetMember alone needs the guid first,
which a UI roster build doesn't have yet). Implemented on
RuntimeFellowshipState.FellowshipView as a materialized snapshot under
the same lock every other read there uses.
SelectionChangeSource.Social covers a fellowship-roster row click
(gmFellowshipUI's list-selection arm calls the same
ACCWeenieObject::SetSelectedObject primitive every other selection
origin uses -- lane B docs/research/2026-08-11-fa-panel-structure.md
§6.2/§2.8).
Runtime tests: +4 (RuntimeFellowshipStateTests.GetMembers_*).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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