Addresses Task 1 code-review: document that ReadEventsAsync.maxEvents is enforced
client-side (no server cap in the wire contract); add Platforms=AnyCPU;x64 to match
sibling drivers; use ValueTask.CompletedTask in FakeHistorianGatewayClient.
Claude-Session: https://claude.ai/code/session_012SDSQ3AcaXqPcBtDESBRii