Judge tests that read another repository against what the check clones, never the desktop's checkout (issue 432)

Tests that read ../../../mesh-catalog or ../../../mesh-host gave a verdict
that depended on what sat beside the checkout: a stale or dirty sibling
failed them on a desktop, and a missing one skipped them unseen. They now
read the clone the build seat puts in MESH_CHECK_BESIDE, failing when it is
absent there, and elsewhere a copy captured at a named commit.

The skip had hidden that the builder test read a module retired by ADR 0190.
The systemd reading test no longer counts the machine's own environment.d.

testdata/beside/mesh-catalog/modules/audit-logger/module.json.captured

@@ -0,0 +1,66 @@
+{
+  "module": "audit-logger",
+  "version": "1",
+  "slug": "audit",
+  "consumes": [
+    "**"
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "code",
+        "kind": "bundle",
+        "language": "typescript",
+        "entrypoints": [
+          "index.js",
+          "tools/index.js"
+        ],
+        "loads": [
+          "index.js",
+          "tools/index.js"
+        ],
+        "env": {
+          "AUDIT_LOG": "${dir:trail}/audit.log",
+          "AUDIT_SPOOL": "${dir:spool}"
+        }
+      }
+    ]
+  },
+  "data": {
+    "own": [
+      {
+        "id": "trail",
+        "path": "${dir:trail}",
+        "class": "valuable",
+        "why": "the audit trail, written nowhere else"
+      },
+      {
+        "id": "spool",
+        "path": "${dir:spool}",
+        "class": "valuable",
+        "why": "events the trail could not take yet; after the bus gives one up, the only copy"
+      }
+    ]
+  },
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "."
+    },
+    {
+      "id": "trail",
+      "type": "directory",
+      "mode": "0700"
+    },
+    {
+      "id": "spool",
+      "type": "directory",
+      "mode": "0700"
+    }
+  ],
+  "capabilities": [
+    "container-runtime"
+  ]
+}