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/local-model-consumer/module.json.captured

@@ -0,0 +1,31 @@
+{
+  "module": "local-model-consumer",
+  "version": "1",
+  "slug": "local",
+  "requires": [
+    "model-access"
+  ],
+  "binds": {
+    "model-access": "${dir:state}/model.json"
+  },
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "."
+    },
+    {
+      "id": "config",
+      "type": "directory",
+      "mode": "0700"
+    },
+    {
+      "id": "openai-env",
+      "type": "file",
+      "path": "${dir:config}/openai.env",
+      "mode": "0600",
+      "content": "OPENAI_BASE_URL=http://${bound:model-access:at}:${bound:model-access:port}/v1\nOPENAI_MODEL=${bound:model-access:model}\nOPENAI_API_KEY=local\n"
+    }
+  ]
+}