Refactor public API around environments

tests/test_runtime.py

@@ -80,6 +80,7 @@ def test_doctor_report_has_runtime_fields() -> None:
         assert "firecracker_bin" in runtime
         assert "guest_agent_path" in runtime
         assert "component_versions" in runtime
+        assert "environments" in runtime
     networking = report["networking"]
     assert isinstance(networking, dict)
     assert "tun_available" in networking