Function validate_protocol_event 

pub fn validate_protocol_event(
    event: &Value,
    strict: bool,
) -> Result<(), ProtocolViolation>

Validate one protocol v1 event envelope.

strict additionally enforces the recommended strict profile: trace is required, and kind-specific payload shapes are checked (see validate_protocol_event_strict_payload).

Returns the first ProtocolViolation found, or Ok(()).