optional semantic retrieval

tests/test_web_api.py

@@ -410,11 +410,25 @@ def test_api_service_settings_can_enable_llm_extractor(monkeypatch, tmp_path):
     assert service.llm_extractor is not None
 
 
+def test_api_service_settings_can_enable_hashing_embedding_provider(tmp_path):
+    service = get_service(
+        Settings(
+            database_path=str(tmp_path / "embedding-settings.sqlite3"),
+            checkout_root=str(tmp_path / "checkouts"),
+            embedding_provider="hashing",
+        )
+    )
+
+    assert service.embedding_provider is not None
+    assert service.embedding_provider.name == "hashing-v1"
+
+
 def test_settings_can_load_from_environment(monkeypatch):
     monkeypatch.setenv("REPO_REGISTRY_DATABASE_PATH", "var/env.sqlite3")
     monkeypatch.setenv("REPO_REGISTRY_CHECKOUT_ROOT", "var/env-checkouts")
     monkeypatch.setenv("REPO_REGISTRY_LLM_PROVIDER", "mock")
     monkeypatch.setenv("REPO_REGISTRY_LLM_MODEL", "demo-model")
+    monkeypatch.setenv("REPO_REGISTRY_EMBEDDING_PROVIDER", "hashing")
 
     settings = Settings()
 
@@ -422,6 +436,7 @@ def test_settings_can_load_from_environment(monkeypatch):
     assert settings.checkout_root == "var/env-checkouts"
     assert settings.llm_provider == "mock"
     assert settings.llm_model == "demo-model"
+    assert settings.embedding_provider == "hashing"
 
 
 def test_api_analysis_run_loop(tmp_path):