The host is a module, so the mesh can build it

novox/hq 04-ISSUES/142 and ADR 0142. Nothing delivered the host because
nothing could compile it, and nothing could compile it partly because the
host was not a thing the mesh builds at all — it had no manifest.

One bundle in Go, for arch, built from cmd/mesh-host. A system is
required for a compiled artifact because a binary is pinned at link time
so a host refuses to touch a machine it was not built for (ADR 0005), and
`arch` is what all four of this mesh's machines report themselves to be.
Another system is another artifact and another build, which is what ADR
0142 means by one per target.

No resources yet. What places a version into a directory named for it
needs an archive resource whose path carries the version, and nothing
interpolates one — the second half of 0141's insight, and the next piece.

module.json

@@ -0,0 +1,17 @@
+{
+  "module": "mesh-host",
+  "version": "1",
+  "slug": "host",
+  "build": {
+    "artifacts": [
+      {
+        "name": "host-arch",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/mesh-host"
+      }
+    ]
+  },
+  "resources": []
+}