Why: the member state machine (active/removed with migration backfill),
re-add reactivation, and the removed-member read-only passage through the
shared-domain authz (doc.read prerequisite decoupled) were delivered on the
RDM working branch 62c77ec; the Backend conversation read path (U3b) remains.
Evidence: build + members/projects/perms/rdmapp full suites green under the
-modfile overlay on 62c77ec.
Impact: task card only.
Refs: plan 2026-10-19-1440 U3; PR #634.
weichen
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