Implemented provider-neutral OpenAI-compatible LLM endpoint support

tests/test_new_config.py

@@ -36,6 +36,44 @@ def test_cli_overrides_take_precedence():
     assert config.max_section_tokens == 2000
 
 
+def test_generic_llm_api_key_env_is_read():
+    config = AuditaConfig.from_sources(env={"AUDITA_LLM_API_KEY": "generic-key"})
+
+    assert config.api_key == "generic-key"
+
+
+def test_generic_llm_api_key_takes_precedence_over_openrouter_env():
+    config = AuditaConfig.from_sources(
+        env={
+            "AUDITA_LLM_API_KEY": "generic-key",
+            "OPENROUTER_API_KEY": "legacy-key",
+        }
+    )
+
+    assert config.api_key == "generic-key"
+
+
+def test_llm_api_key_cli_override_takes_precedence_over_env():
+    config = AuditaConfig.from_sources(
+        env={
+            "AUDITA_LLM_API_KEY": "generic-key",
+            "OPENROUTER_API_KEY": "legacy-key",
+        },
+        overrides=ConfigOverrides(llm_api_key="cli-key"),
+    )
+
+    assert config.api_key == "cli-key"
+
+
+def test_blank_llm_api_key_override_resolves_to_none():
+    config = AuditaConfig.from_sources(
+        env={"OPENROUTER_API_KEY": "legacy-key"},
+        overrides=ConfigOverrides(llm_api_key="   "),
+    )
+
+    assert config.api_key is None
+
+
 def test_module_key_overrides_take_precedence():
     config = AuditaConfig.from_sources(
         env={"AUDITA_MODULES": "grammar"},