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/main.rs

@@ -49,9 +49,6 @@ async fn main() -> Result<()> {
         Commands::StoreAsrx { uuid } => {
             handle_store_asrx(&uuid).await?;
         }
-        Commands::Story { uuid } => {
-            handle_story(&uuid).await?;
-        }
         Commands::Vectorize { uuid } => {
             handle_vectorize(&uuid).await?;
         }
@@ -169,13 +166,6 @@ async fn handle_chunk(uuid: &str) -> Result<()> {
 }
 
 /// Handle story command
-async fn handle_story(uuid: &str) -> Result<()> {
-    println!("Generating story for: {}", uuid);
-
-    // TODO: Implement story logic
-    Ok(())
-}
-
 /// Handle vectorize command
 async fn handle_vectorize(uuid: &str) -> Result<()> {
     println!("Vectorizing chunks for: {}", uuid);