Why: U7B-B (split sub-unit from U7B) succeeded with cursor-agent attempt 1 (run_id=925ae274…) terminal_status=success after widening allowed_paths to include perms_api.go and member_search_test.go per attempt 1 scope-expansion feedback; transport refs/agent-exec/925ae274…/c8536afce513 fast-forwarded to feature/iam-link-u2-single-role-authority @ 83dd244c, then pushed. Evidence: agent-exec run receipt /tmp/iam-link-u7b-b-run.json terminal_status=success, transport.commit=83dd244c5b476d9a9e719ec6d18dd615f7822329; host verification shows internal/rdmapp + internal/projects tests pass; plugins/rdm tests have 4 expected failures (TestAuditReaderSeesRuleOptionsBindingsAndTraceMetadataWithoutBody, TestU1DocumentExportUsesContentPermission, TestDocReadHonorsStageRange, reg_citation) which are U7B-C scope. Impact: U7B-B implementation complete; U7B-C dispatch ready (plugins/rdm tests must be rewritten to match new body-level shared-read rules). Refs: plan revision 3 U7; PR #628.