feat(dapi): chained document queries on the getDocuments V1 wire

packages/dapi-grpc/build.rs

@@ -10,6 +10,7 @@ use tonic_prost_build::Builder;
 const SERDE_WITH_BYTES: &str = r#"#[cfg_attr(feature = "serde", serde(with = "serde_bytes"))]"#;
 const SERDE_WITH_BASE64: &str =
     r#"#[cfg_attr(feature = "serde", serde(with = "crate::deserialization::vec_base64string"))]"#;
+const SERDE_DEFAULT: &str = r#"#[cfg_attr(feature = "serde", serde(default))]"#;
 const SERDE_WITH_STRING: &str =
     r#"#[cfg_attr(feature = "serde", serde(with = "crate::deserialization::from_to_string"))]"#;
 
@@ -335,6 +336,11 @@ fn configure_platform(mut platform: MappingConfig) -> MappingConfig {
         .field_attribute("id", SERDE_WITH_BYTES)
         .field_attribute("identity_id", SERDE_WITH_BYTES)
         .field_attribute("ids", SERDE_WITH_BASE64)
+        // Wire-format compat for mock vectors captured before the chained
+        // surface existed: the field deserializes to its default when
+        // absent (same pattern DocumentQuery's own serde defaults follow
+        // for pre-SQL-surface fixtures).
+        .field_attribute("GetDocumentsRequestV1.chained", SERDE_DEFAULT)
         .field_attribute("ResponseMetadata.height", SERDE_WITH_STRING)
         .field_attribute("ResponseMetadata.time_ms", SERDE_WITH_STRING)
         .field_attribute("start_at_ms", SERDE_WITH_STRING)