refactor(cleanup): remove legacy CLI and complete EvoAgent migration cleanup

- Delete backend/cli.py and all CLI-specific tests (test_cli.py,
  test_openclaw_cli_service.py, test_skills_cli.py)
- Remove evotraders console script from pyproject.toml
- Update README/CLAUDE.md to reference python backend/main.py instead of CLI
- Add pytest-asyncio to dev dependencies
- Enhance EvoAgent with reload_runtime_assets and backward-compat attrs
- Align tests with updated API semantics and gateway process models

Constraint: CLI is deprecated in favor of split-service runtime model
Confidence: high
Scope-risk: moderate

backend/tests/test_runtime_service_app.py

@@ -38,8 +38,13 @@ def test_runtime_service_health_and_status(monkeypatch):
     assert health_response.json() == {
         "status": "healthy",
         "service": "runtime-service",
-        "gateway_running": False,
-        "gateway_port": 9876,
+        "gateway": {
+            "running": False,
+            "port": 9876,
+            "pid": None,
+            "process_status": "not_running",
+            "returncode": None,
+        },
     }
     assert status_response.status_code == 200
     assert status_response.json() == {
@@ -48,6 +53,8 @@ def test_runtime_service_health_and_status(monkeypatch):
         "runtime": {
             "gateway_running": False,
             "gateway_port": 9876,
+            "gateway_pid": None,
+            "gateway_process_status": "not_running",
             "has_runtime_manager": True,
         },
     }
@@ -365,6 +372,8 @@ def test_runtime_service_start_stop_lifecycle_contract(monkeypatch, tmp_path):
             return self.context
 
     class _DummyProcess:
+        pid = 12345
+
         def poll(self):
             return None
 
@@ -574,6 +583,8 @@ def test_start_runtime_restore_reuses_historical_run_id(monkeypatch, tmp_path):
             return self.context
 
     class _DummyProcess:
+        pid = 12345
+
         def poll(self):
             return None