claude-code: register the agent's configuration at three scopes, served as the nox-mesh plugin

Skills, subagents, commands and hooks had no machine-wide place, so they were
copied into homes by hand and drifted. Each is now registered once through the
module's tools, kept in its config state, and written per node: the plugin in
the managed directory, settings and instructions in the managed files, or the
account's own directory, touching only what the module placed. hq ADR 0216.

modules/claude-code/cmd/claude-code/node.go

@@ -62,6 +62,8 @@ func (p Paths) binding() string     { return filepath.Join(p.State, "licence.jso
 func (p Paths) apiKey() string      { return filepath.Join(p.State, "api-key") }
 func (p Paths) helper() string      { return filepath.Join(p.State, "api-key-helper") }
 func (p Paths) registry() string    { return filepath.Join(p.State, "mcp-servers.json") }
+func (p Paths) config() string      { return filepath.Join(p.State, "config.json") }
+func (p Paths) placed() string      { return filepath.Join(p.State, "home-placed.json") }
 
 // Ask is a tool on the bus: its address and arguments in, its JSON answer out.
 type Ask func(address string, args any) (json.RawMessage, error)
@@ -116,12 +118,23 @@ func RenderNow(p Paths, write WriteManaged) ([]string, error) {
 	if readJSON(p.binding(), &b) {
 		binding = &b
 	}
-	files := Render(facts, settings, binding, p.helper(), Registered(p))
+	var items map[string]Item
+	_ = readJSON(p.config(), &items)
+	config := ConfigOf(items)
+	files := Render(facts, settings, binding, p.helper(), Registered(p), config)
+	tree, _ := json.Marshal(Marketplace(config))
+	files[MarketplaceDir+"/"] = string(tree)
 	names := make([]string, 0, len(files))
 	for n := range files {
 		names = append(names, n)
 	}
-	sort.Strings(names)
+	// The marketplace first: the settings that enable its plugin must never name one that is not there yet.
+	sort.Slice(names, func(i, j int) bool {
+		if (names[i] == MarketplaceDir+"/") != (names[j] == MarketplaceDir+"/") {
+			return names[i] == MarketplaceDir+"/"
+		}
+		return names[i] < names[j]
+	})
 	var out []string
 	for _, n := range names {
 		line, err := write(n, files[n])
@@ -130,6 +143,14 @@ func RenderNow(p Paths, write WriteManaged) ([]string, error) {
 		}
 		out = append(out, line)
 	}
+	// The home scope: what this module places in the account's own agent directory (ADR 0182).
+	done, left := PlaceHome(p, HomeFiles(config))
+	for _, line := range done {
+		out = append(out, "home "+line)
+	}
+	for _, line := range left {
+		out = append(out, "home "+line)
+	}
 	return out, nil
 }