fix: preserve X Article block order

Cargo.lock

@@ -1543,6 +1543,7 @@ version = "1.0.150"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e8014e44b4736ed0538adeecded0fce2a272f22dc9578a7eb6b2d9993c74cfb9"
 dependencies = [
+ "indexmap",
  "itoa",
  "memchr",
  "serde",

Cargo.toml

@@ -19,7 +19,7 @@ hex = "0.4.3"
 regex = "1.12.2"
 rusqlite = { version = "0.32.1", features = ["bundled"] }
 serde = { version = "1.0.228", features = ["derive"] }
-serde_json = "1.0.132"
+serde_json = { version = "1.0.132", features = ["preserve_order"] }
 sha3 = "0.10.8"
 tempfile = "3.13.0"
 tokio = { version = "1.41.1", features = ["macros", "rt-multi-thread", "net", "fs", "io-util"] }

crates/archivr-core/src/summarizer.rs

@@ -1274,6 +1274,23 @@ mod tests {
         );
     }
 
+    #[test]
+    fn extract_tweet_text_keeps_article_block_object_field_order() {
+        let tweet: serde_json::Value = serde_json::from_str(
+            r#"{
+                "article": {
+                    "title": "Ordered block",
+                    "blocks": [{"heading": "Opening", "content": "Body copy"}]
+                }
+            }"#,
+        )
+        .unwrap();
+        assert_eq!(
+            extract_tweet_text(&tweet).as_deref(),
+            Some("Ordered block\n\nOpening\n\nBody copy")
+        );
+    }
+
     #[test]
     fn extract_tweet_text_falls_back_from_article_preview_to_summary_then_tweet_body() {
         let preview = serde_json::json!({