fix: support qdrant-only vector maintenance

harness/tht/cli/memory_cmd.py

@@ -43,6 +43,12 @@ def _resync_memory(cfg):
     )
 
 
+def clear_memory_index(cfg):
+    from tht.adapters.factory import build_vector_store
+
+    return build_vector_store(cfg, require_write=True).delete_kinds("memory", ["memory"])
+
+
 @memory_app.command("promote")
 def promote_cmd(
     session: str = typer.Option(..., "--session"),
@@ -192,7 +198,6 @@ def clear_cmd(
     config: Path = CONFIG_OPT,
 ) -> None:
     """Cancella TUTTA la review memory: registro canonico + indice pgvector (kind=memory)."""
-    from tht.cli.vector_cmd import make_embedder, open_store, require_direct_vector_cfg
     from tht.memory import load_registry
 
     cfg = _load_config_or_exit(config)
@@ -209,10 +214,7 @@ def clear_cmd(
         typer.secho("Annullato.", fg=typer.colors.YELLOW)
         raise typer.Exit(code=1)
 
-    # Indice pgvector: rimuove i record kind=memory (sync con insieme vuoto).
-    require_direct_vector_cfg(cfg)
-    store = open_store(cfg, "memory")
-    store.sync([], make_embedder(cfg.embeddings), kinds={"memory"})
+    clear_memory_index(cfg)
 
     # Registro canonico.
     registry.unlink()