Finalize GTL and retire S/R research harness

tests/unit/test_scheduler.py

@@ -3,15 +3,27 @@
 import pytest
 
 from app.scheduler import (
-    _is_job_enabled,
+    _consume_backtest_target_model,
     _parse_frequency,
     _resume_tickers,
     _last_successful,
     configure_scheduler,
+    queue_backtest_target_model,
     scheduler,
 )
 
 
+def test_manual_backtest_target_model_is_one_shot():
+    assert queue_backtest_target_model("structural_sr") == "structural_sr"
+    assert _consume_backtest_target_model() == "structural_sr"
+    assert _consume_backtest_target_model() == "production_gtl"
+
+
+def test_manual_backtest_target_model_rejects_removed_research_arms():
+    with pytest.raises(ValueError, match="Unknown backtest target model"):
+        queue_backtest_target_model("production_control")
+
+
 class TestParseFrequency:
     def test_hourly(self):
         assert _parse_frequency("hourly") == {"hours": 1}