health: surface ssh output when probe fails

apps/macos/Tests/ClawdisIPCTests/HealthDecodeTests.swift

@@ -0,0 +1,35 @@
+import Foundation
+import Testing
+@testable import Clawdis
+
+@Suite struct HealthDecodeTests {
+    private let sampleJSON: String = {
+        // minimal but complete payload
+        """
+        {"ts":1733622000,"durationMs":420,"web":{"linked":true,"authAgeMs":120000,"connect":{"ok":true,"status":200,"error":null,"elapsedMs":800}},"heartbeatSeconds":60,"sessions":{"path":"/tmp/sessions.json","count":1,"recent":[{"key":"abc","updatedAt":1733621900,"age":120000}]},"ipc":{"path":"/tmp/ipc.sock","exists":true}}
+        """
+    }()
+
+    @Test func decodesCleanJSON() async throws {
+        let data = Data(sampleJSON.utf8)
+        let snap = decodeHealthSnapshot(from: data)
+
+        #expect(snap?.web.linked == true)
+        #expect(snap?.sessions.count == 1)
+        #expect(snap?.ipc.exists == true)
+    }
+
+    @Test func decodesWithLeadingNoise() async throws {
+        let noisy = "debug: something logged\n" + sampleJSON + "\ntrailer"
+        let snap = decodeHealthSnapshot(from: Data(noisy.utf8))
+
+        #expect(snap?.web.connect?.status == 200)
+    }
+
+    @Test func failsWithoutBraces() async throws {
+        let data = Data("no json here".utf8)
+        let snap = decodeHealthSnapshot(from: data)
+
+        #expect(snap == nil)
+    }
+}