feat(search): index + return recording_date on search hits (#61)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/search/tests/search.rs

@@ -19,6 +19,7 @@ fn doc(id: &str, object_name: &str, fields_text: &[&str]) -> SearchDocument {
         brief_description: None,
         current_owner: None,
         recorder: None,
+        recording_date: None,
         visibility: "draft".to_string(),
         fields_text: fields_text.iter().map(|s| s.to_string()).collect(),
     }
@@ -66,6 +67,7 @@ async fn search_objects_returns_hits_with_highlight_filter_and_paging() {
         &["cast bronze with green patina"],
     );
     bronze_a.visibility = "public".to_string();
+    bronze_a.recording_date = Some("1962-04-03".to_string());
     let mut bronze_b = doc(&b.to_string(), "Ceremonial bowl", &["bronze alloy rim"]);
     bronze_b.visibility = "public".to_string();
     let mut bronze_c = doc(&c.to_string(), "Door fitting", &["bronze hinge"]);
@@ -87,6 +89,7 @@ async fn search_objects_returns_hits_with_highlight_filter_and_paging() {
         "snippet must mark the match"
     );
     assert!(snippet.contains(search::HL_POST));
+    assert_eq!(hit.recording_date.as_deref(), Some("1962-04-03"));
 
     let public = client
         .search_objects("bronze", Some("public"), 0, 20)