ssh-client: the mesh's region first in ~/.ssh/config, its hosts in config.d, tools in Go

The region at the end let earlier Host lines win over the mesh's (research 027/03). A
roster fact cannot be placed at the start, so the region holds one Include of config.d,
and the hosts are config.d/00-mesh, read first. Eight tools; authorized_keys and
known_hosts stay found until the controller holds those facts.

modules/ssh-client/module.json

@@ -1,6 +1,16 @@
 {
   "module": "ssh-client",
   "version": "1",
+  "tools": [
+    "ssh_client_hosts",
+    "ssh_client_resolve",
+    "ssh_client_check",
+    "ssh_client_keys",
+    "ssh_client_authorized",
+    "ssh_client_revoke",
+    "ssh_client_known_host",
+    "ssh_client_test"
+  ],
   "resources": [
     {
       "id": "ssh-dir",
@@ -8,14 +18,45 @@
       "path": "${machine:account-home}/.ssh",
       "owner": "${machine:account}",
       "mode": "0700"
+    },
+    {
+      "id": "config-d",
+      "type": "directory",
+      "path": "${machine:account-home}/.ssh/config.d",
+      "owner": "${machine:account}",
+      "mode": "0700"
+    },
+    {
+      "id": "config",
+      "type": "file",
+      "path": "${machine:account-home}/.ssh/config",
+      "owner": "${machine:account}",
+      "mode": "0600",
+      "into": "block",
+      "at": "start",
+      "content": "# The mesh's region (module ssh-client, novox/hq research 027/03). It comes first because ssh\n# takes the first value it finds for each option. It brings in ~/.ssh/config.d/ in name order:\n# 00-mesh, the mesh's Host per machine, then each file another module places there. Replaced at\n# every push. Everything below it is yours, kept as you wrote it, and applies to every host the\n# files above leave unsettled.\nInclude ~/.ssh/config.d/*\n"
     }
   ],
   "facts": {
-    "ssh-config": {
-      "path": ".ssh/config",
+    "mesh-hosts": {
+      "path": ".ssh/config.d/00-mesh",
       "home": true,
-      "shared": true,
-      "template": "# The mesh's Host blocks — every other node, so `ssh <node>` reaches it as the\n# right account. This region is replaced whenever a node joins, leaves or is\n# renamed; the rest of this file is yours and is kept untouched.\n{{range .Machines}}{{if ne .Name $.Node}}\nHost {{.Name}} {{.FQDN}}\n  HostName {{.FQDN}}\n{{if .Account}}  User {{.Account}}\n{{end}}{{end}}{{end}}"
+      "template": "# Generated by the mesh. Do not edit — module ssh-client writes this file whenever a machine\n# joins, leaves or is renamed. ~/.ssh/config includes it first, so these hosts win over every\n# later line; a host of your own goes below the mesh's region in ~/.ssh/config.\n{{range .Machines}}{{if ne .Name $.Node}}\nHost {{.Name}} {{.FQDN}}\n  HostName {{.FQDN}}\n{{if .Account}}  User {{.Account}}\n{{end}}{{end}}{{end}}"
     }
+  },
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/ssh-client-tools",
+        "binary": "ssh-client-tools",
+        "loads": [
+          "ssh-client-tools"
+        ]
+      }
+    ]
   }
 }