Remove View.enable_fts()

The method existed only to raise NotImplementedError, since
full-text search is not supported for views, and it showed up in
the generated API reference as a documented View method. Calling
enable_fts() on a View now raises AttributeError like any other
missing method. The sqlite-utils enable-fts command uses db.table()
and shows a clean error when pointed at a view instead of a
traceback.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UnLnhsH25Nnv7LHhekUfPd

tests/test_fts.py

@@ -461,12 +461,12 @@ def test_enable_fts_replace_handles_legacy_bracket_quoted_content_table():
     assert 'content="books"' in db["books_fts"].schema
 
 
-def test_enable_fts_error_message_on_views():
+def test_view_has_no_enable_fts():
     db = Database(memory=True)
     db.create_view("hello", "select 1 + 1")
-    with pytest.raises(NotImplementedError) as e:
-        db["hello"].enable_fts()  # type: ignore[call-arg]
-        assert e.value.args[0] == "enable_fts() is supported on tables but not on views"
+    # Views deliberately do not have an enable_fts() method
+    with pytest.raises(AttributeError):
+        db["hello"].enable_fts()  # type: ignore[union-attr]
 
 
 @pytest.mark.parametrize(
@@ -718,3 +718,17 @@ def test_search_quote(fresh_db):
         list(table.search(query))
     # No exception with quote=True
     list(table.search(query, quote=True))
+
+
+def test_enable_fts_cli_on_view_errors(tmpdir):
+    db_path = str(tmpdir / "test.db")
+    db = Database(db_path)
+    db["t"].insert({"text": "hello"})
+    db.create_view("v", "select * from t")
+    db.close()
+    from click.testing import CliRunner
+    from sqlite_utils import cli as cli_module
+
+    result = CliRunner().invoke(cli_module.cli, ["enable-fts", db_path, "v", "text"])
+    assert result.exit_code == 1
+    assert result.output.strip() == "Error: Table v is actually a view"