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

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

crates/search/src/lib.rs

@@ -34,6 +34,7 @@ pub struct SearchDocument {
     pub brief_description: Option<String>,
     pub current_owner: Option<String>,
     pub recorder: Option<String>,
+    pub recording_date: Option<String>,
     /// Filterable: "draft" | "internal" | "public".
     pub visibility: String,
     /// Flexible field values flattened to searchable text.
@@ -55,6 +56,7 @@ pub struct SearchHit {
     pub object_name: String,
     pub brief_description: Option<String>,
     pub visibility: String,
+    pub recording_date: Option<String>,
     pub snippet: Option<String>,
 }
 
@@ -233,6 +235,7 @@ impl SearchClient {
                     object_name: doc.object_name,
                     brief_description: doc.brief_description,
                     visibility: doc.visibility,
+                    recording_date: doc.recording_date,
                     snippet,
                 }
             })
@@ -367,6 +370,7 @@ pub async fn build_document(
         brief_description: object.brief_description.clone(),
         current_owner: object.current_owner.clone(),
         recorder: object.recorder.clone(),
+        recording_date: object.recording_date.map(|d| d.to_string()),
         visibility: object.visibility.as_str().to_owned(),
         fields_text,
     })