feat(client): report per-protocol presence in HTB and network_monitor

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uc9V1v7iXruubpoLiSE24M

tests/test_network_monitor_connectivity.py

@@ -0,0 +1,26 @@
+import asyncio
+
+from hbd.client import connectivity
+from hbd.client.plugins.network_monitor import NetworkMonitorPlugin
+
+
+class _FakeShared:
+    def as_metric(self):
+        return {"ipv4": {"present": True, "addr": "192.0.2.5", "gateway": "192.0.2.1", "rtt": 9.0},
+                "ipv6": {"present": False, "addr": None, "gateway": None, "rtt": None}}
+
+
+def test_collect_includes_connectivity_when_probe_running():
+    connectivity.set_shared(_FakeShared())
+    try:
+        data = asyncio.run(NetworkMonitorPlugin()._collect_metrics())
+    finally:
+        connectivity.set_shared(None)
+    assert data["connectivity"]["ipv4"]["present"] is True
+    assert data["connectivity"]["ipv6"]["present"] is False
+
+
+def test_collect_omits_connectivity_without_probe():
+    connectivity.set_shared(None)
+    data = asyncio.run(NetworkMonitorPlugin()._collect_metrics())
+    assert "connectivity" not in data