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This package defines the Community v0.15 messages.dsh/v1alpha1 MessageObserver coordinates, negotiation definition, event types, and validators for the ContentBlock text/image subset. Event sources, subscription dispatch, and authorization interfaces are supplied by implementations.
The rc1 envelope remains valid. Producers may additionally provide structured scope, correlation, redaction, payload schema, and envelope-version metadata; absence of redactions in a legacy event does not assert that no redaction occurred.