Checkpoint source 7 workflows and in-progress diagram authoring redesign

Preserve current core, source, REST, desktop, recovery, documentation and validation work, including AGENTS.md and the development summary. This is a work-in-progress checkpoint: the new compact palette has outstanding compilation errors and native acceptance; earlier passing gates retain their documented scope.

crates/oa-server/tests/http/data_contracts.rs

@@ -185,7 +185,7 @@ async fn published_data_contract_queries_atomic_edits_identity_and_restart() {
         .text()
         .await
         .unwrap();
-    assert!(source.starts_with("arcadia 6;"));
+    assert!(source.starts_with("arcadia 7;"));
     assert_eq!(oa_core::language::parse(&source).unwrap(), removed.model);
     server.stop().await;
     let server = TestServer::start(directory.path(), None).await;
@@ -244,7 +244,7 @@ async fn authored_schema3_bundle_upgrade_reports_data_defaults_and_preserves_fil
         1
     );
     assert_eq!(stored.source_project.files.len(), 2);
-    assert!(stored.source_project.files["legacy.arcadia"].contains("arcadia 6;"));
+    assert!(stored.source_project.files["legacy.arcadia"].contains("arcadia 7;"));
     for text in [
         "// Event rationale",
         "// Interface rationale",
@@ -288,7 +288,7 @@ async fn existing_schema3_coupled_envelope_upgrades_in_memory_until_explicit_sav
     assert_eq!(opened.revision, 17);
     assert_eq!(opened.model.schema_version, oa_core::SCHEMA_VERSION);
     assert_eq!(opened.migration.as_ref().unwrap().from_schema, 3);
-    assert!(opened.source_project.files["project.arcadia"].contains("arcadia 6;"));
+    assert!(opened.source_project.files["project.arcadia"].contains("arcadia 7;"));
     assert_pair(&opened);
     assert_eq!(std::fs::read(&filename).unwrap(), original);
     assert_eq!(
@@ -475,6 +475,7 @@ async fn qualified_call_reply_values_reject_invalid_edits_and_survive_identity_s
                 receiver: Some(to),
                 message_kind,
                 reply_to,
+                operation: None,
                 values: vec![],
             },
             precondition: String::new(),
@@ -720,7 +721,7 @@ async fn qualified_call_reply_values_reject_invalid_edits_and_survive_identity_s
         .text()
         .await
         .unwrap();
-    assert!(source.starts_with("arcadia 6;"));
+    assert!(source.starts_with("arcadia 7;"));
     assert_eq!(oa_core::language::parse(&source).unwrap(), changed.model);
     let saved = std::fs::read(&filename).unwrap();
     server.stop().await;