994c0b3b19
MTConnectObservation.SampleRate was parsed per observation and never read; MTConnectTagDefinition.MtType/MtSubType/Units were carried (factory blob DTO, tags[] DTO, probe inference) and only MtCategory was ever read. Deleted. Stored configs and TagConfig blobs still carrying mtType/mtSubType/units keep loading (System.Text.Json skips unmapped members) - pinned by a new test. The AdminUI tag editor reads those keys straight off the blob and is unaffected. Refs #743 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT