Add runtime capability scaffolding and align docs

tests/test_runtime.py

@@ -5,7 +5,7 @@ from pathlib import Path
 
 import pytest
 
-from pyro_mcp.runtime import doctor_report, resolve_runtime_paths
+from pyro_mcp.runtime import doctor_report, resolve_runtime_paths, runtime_capabilities
 
 
 def test_resolve_runtime_paths_default_bundle() -> None:
@@ -67,7 +67,19 @@ def test_doctor_report_has_runtime_fields() -> None:
     report = doctor_report()
     assert "runtime_ok" in report
     assert "kvm" in report
+    assert "networking" in report
     if report["runtime_ok"]:
         runtime = report.get("runtime")
         assert isinstance(runtime, dict)
         assert "firecracker_bin" in runtime
+    networking = report["networking"]
+    assert isinstance(networking, dict)
+    assert "tun_available" in networking
+
+
+def test_runtime_capabilities_reports_shim_bundle() -> None:
+    paths = resolve_runtime_paths()
+    capabilities = runtime_capabilities(paths)
+    assert capabilities.supports_vm_boot is False
+    assert capabilities.supports_guest_exec is False
+    assert capabilities.supports_guest_network is False