refactor: remove face embedding architecture - single Qdrant _faces collection

- Delete FaceEmbeddingDb module (face_embedding_db.rs)
- Stub match_faces_iterative, generate_seed_embeddings, tmdb_match_handler
- Remove sync_trace_embeddings, populate_face_embeddings_to_qdrant
- Remove embedding from face.json output (face_processor.py)
- Remove embedding from PG UPDATE (store_traced_faces.py)
- Remove workspace traces staging (checkin.rs, qdrant_workspace.rs)
- Fix tests: add pose_angle to Face, hand_nodes to TkgResult

Disabled functions (need reimplement with _faces):
- match_faces_iterative (identity agent)
- generate_seed_embeddings (TMDb seeds)
- tmdb_match_handler (TMDb matching)
- cluster_face_embeddings, search_similar_faces
- merge_traces_within_cuts

src/ui/progress/mod.rs

@@ -21,7 +21,6 @@ pub enum ProcessorType {
     Face,
     Pose,
     Hand,
-    Story,
     Caption,
 }
 
@@ -37,7 +36,6 @@ impl ProcessorType {
             ProcessorType::Face => "Face",
             ProcessorType::Pose => "Pose",
             ProcessorType::Hand => "Hand",
-            ProcessorType::Story => "Story",
             ProcessorType::Caption => "Caption",
         }
     }
@@ -145,7 +143,6 @@ impl ProgressState {
                 ProcessorProgress::new(ProcessorType::Face),
                 ProcessorProgress::new(ProcessorType::Pose),
                 ProcessorProgress::new(ProcessorType::Hand),
-                ProcessorProgress::new(ProcessorType::Story),
                 ProcessorProgress::new(ProcessorType::Caption),
             ],
             video_name: video_name.to_string(),
@@ -201,7 +198,6 @@ impl ProgressState {
             "OCR" => ProcessorType::Ocr,
             "FACE" => ProcessorType::Face,
             "POSE" => ProcessorType::Pose,
-            "STORY" => ProcessorType::Story,
             "CAPTION" => ProcessorType::Caption,
             _ => return,
         };