5e49006cfa7ea21c270b0abbf20d98f16754ba99
Add ValidateConfigUpdate to StreamManager with immutability rules for storage type, mirror, sources, and retention policy; sealed stream guard; MaxConsumers decrease prevention; even-replica rejection; and subject overlap detection against peer streams. Wire the check into CreateOrUpdate for all update paths. 12 new tests in ConfigUpdateValidationTests.cs cover all rules including the StreamManager integration test.
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C#
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