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- WcfTagExtendedPropertyProtocolTests: add a multi-group golden test mirroring the live capture (one group per property + uint16 flags trailer) that the old parser failed; correct the synthetic builder to the uint16-flags trailer. - HistorianGrpcIntegrationTests: add GetConnectionStatusAsync_OverGrpc_ReportsConnected (plan #5); tighten the write-lifecycle read-back to a hard assert now that the parser is fixed; make sandbox cleanup generous best-effort (rename is async + the browse view is eventually consistent, so a hard absence assert was racy). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC