records: port to Go, and keep the checkout in a directory it owns

Every sync had failed since a container that ran as root left the checkout
root's: git refused it as dubious ownership, and records answered from a
stale copy. The Go bundle clones into repository/ under its directory, clears
the old layout where it can and names what it cannot. Drops the container-
runtime capability the move into the runtime left behind. hq issue 251.

modules/records/module.json

@@ -2,9 +2,6 @@
   "module": "records",
   "version": "1",
   "slug": "records",
-  "capabilities": [
-    "container-runtime"
-  ],
   "requires": [
     "git"
   ],
@@ -60,14 +57,12 @@
       {
         "name": "code",
         "kind": "bundle",
-        "language": "typescript",
-        "entrypoints": [
-          "index.js",
-          "tools/index.js"
-        ],
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/records",
+        "binary": "records",
         "loads": [
-          "index.js",
-          "tools/index.js"
+          "records"
         ],
         "env": {
           "MESH_RECORDS_CONFIG_FILE": "${dir:mesh-state}/config.json",