fix: agent_search tool descriptions + HAND_OBJECT casing + rule2 edge types

- agent_search.rs: text_region -> text_trace, removed skin_tone_trace
  (never built, misleading LLM agents)
- tkg.rs + scan.rs: hand_object -> HAND_OBJECT for consistency with
  all other edge types (CO_OCCURS_WITH, SPEAKS_AS, etc.)
- rule2_ingest.rs: added LIP_SYNC and HAND_OBJECT to edge_type
  priority list so these edges generate relationship chunks

src/core/chunk/rule2_ingest.rs

@@ -51,8 +51,10 @@ pub async fn ingest_rule2(
         "SPEAKS_AS",
         "MUTUAL_GAZE",
         "CO_OCCURS_WITH",
+        "LIP_SYNC",
         "HAS_APPEARANCE",
         "WEARS",
+        "HAND_OBJECT",
     ];
     let total_types = edge_types.len();
 

src/core/processor/tkg.rs

@@ -2930,7 +2930,7 @@ async fn build_hand_object_edges(
                                 "#,
                                 edges_table
                             ))
-                            .bind("hand_object")
+                            .bind("HAND_OBJECT")
                             .bind(hand_id)
                             .bind(obj_id)
                             .bind(file_uuid)