Status -> done. Acceptance criteria all checked off except the operator
smoke test (full invite -> accept across two browsers), which requires
a live dev stack. Added a 'design decisions captured here' section
covering (a) why caller role is derived from workspace_members not
from the resolve query, (b) the new tRPC errorFormatter that exposes
error.cause, and (c) why the invite dialog doesn't offer 'owner' role
even though the schema accepts it.
Co-authored-by: Cursor <cursoragent@cursor.com>