fix: remove dead vector migrate command

harness/tht/cli/vector_cmd.py

@@ -8,7 +8,7 @@ from tht.cli.schema_cmd import _load_config_or_exit, annotations_path, physical_
 from tht.ports.vector import VectorWriteRecord
 from tht.vectorstore.store import SyncStats, content_hash
 
-vector_app = typer.Typer(help="Indice semantico pgvector (derivato, rigenerabile)")
+vector_app = typer.Typer(help="Indice semantico Qdrant (derivato, rigenerabile)")
 
 
 def make_embedder(embeddings_cfg):
@@ -33,8 +33,7 @@ def require_vector_cfg(cfg):
 
 
 def open_searcher(cfg):
-    """Searcher per la LETTURA (similarity search): via REST se `vector_rest` è configurato,
-    altrimenti connessione diretta (dev/test)."""
+    """Searcher per la lettura semantic search sul runtime vettoriale attivo."""
     from tht.adapters.factory import build_vector_store
     from tht.vectorstore.reader import tables_for_kinds
 
@@ -119,7 +118,7 @@ def init_cmd(
 
 @vector_app.command("index-schema")
 def index_schema_cmd(config: Path = CONFIG_OPT) -> None:
-    """Embedda e sincronizza i record schema (tabelle e colonne) da mschema."""
+    """Embedda e sincronizza i record schema (tabelle e colonne) nel semantic store."""
     from tht.mschema.models import Annotations, PhysicalSchema
     from tht.vectorstore.records import schema_records