release: v1.3.0 - TKG node type renaming

Changes:
- Rust: face_trace → face_track (45 occurrences in 8 files)
- Rust: gaze_trace → gaze_track, lip_trace → lip_track
- Python: tkg_builder.py unified + pipeline_checklist.py fixed
- Swift: swift_hand.swift hand state detection (empty vs holding)

Node type changes:
  face_trace    → face_track
  person_trace  → body_track
  gaze_trace    → gaze_track
  lip_trace     → lip_track
  hand_trace    → hand_track
  speaker       → speaker_segment
  object        → detected_object
  text_trace    → text_region

Migration:
  PUBLIC schema: 12970 + 892 + 305 rows updated

src/api/scan.rs

@@ -469,7 +469,7 @@ async fn get_ingestion_status(
             Some(format!("{scene_count} scene chunks"))
         ),
         step!(
-            "face_trace",
+            "face_track",
             trace_count > 0,
             Some(format!("{trace_count} traces / {face_total} detections"))
         ),