Add private complete mixed Project resolution with retained provenance

crates/oa-core/src/language.rs

@@ -1664,17 +1664,25 @@ impl Parser<'_> {
     }
 }
 
-pub(crate) fn resolve_declarations(
+// The construction phase is shared with private mixed resolution. Migration and
+// complete-model admission remain exclusively in each caller's finishing tail.
+struct ConstructedDeclarations {
+    project: Project,
+    legacy_elements: serde_json::Map<String, Value>,
+}
+
+fn construct_declarations<'a>(
     mut project: Project,
-    declarations: &[Declaration],
+    declarations: impl IntoIterator<Item = &'a Declaration>,
     aliases: &BTreeMap<String, Id>,
-    limits: ParseLimits,
-) -> Result<crate::persistence::DecodeResult, (usize, Error)> {
+    mut before_fields: impl FnMut(&Declaration) -> Result<(), Error>,
+) -> Result<ConstructedDeclarations, (usize, Error)> {
     let legacy = project.schema_version == 3;
     let mut legacy_elements = serde_json::Map::new();
     let mut nodes = Vec::new();
-    for (index, declaration) in declarations.iter().enumerate() {
+    for (index, declaration) in declarations.into_iter().enumerate() {
         (|| -> Result<(), Error> {
+            before_fields(declaration)?;
             let mut fields = declaration
                 .fields
                 .iter()
@@ -1899,6 +1907,18 @@ pub(crate) fn resolve_declarations(
             .map_err(|error| (index, error))?;
         target.nodes.insert(node.id, node);
     }
+    Ok(ConstructedDeclarations { project, legacy_elements })
+}
+
+pub(crate) fn resolve_declarations(
+    project: Project,
+    declarations: &[Declaration],
+    aliases: &BTreeMap<String, Id>,
+    limits: ParseLimits,
+) -> Result<crate::persistence::DecodeResult, (usize, Error)> {
+    let legacy = project.schema_version == 3;
+    let ConstructedDeclarations { project, legacy_elements } =
+        construct_declarations(project, declarations, aliases, |_| Ok(()))?;
     if legacy {
         let migrated = source3_bridge::from_scratch(project, legacy_elements)
             .and_then(|old| crate::persistence::v3::migrate(old, limits))