Function decode_solve_request_v1 

pub fn decode_solve_request_v1(
    input: &str,
) -> Result<SolveRequestV1, SolveErrorEnvelopeV1>

Decode and structurally validate one solve-json v1 request.

In addition to Serde’s deny_unknown_fields enforcement, this entry point attaches exact JSONPath-like locations to unknown fields, missing required fields, invalid enums, and an unsupported schema version. Transport implementations should use this function rather than deserializing SolveRequestV1 directly when they need a protocol error envelope.