claude-code: act on the review of the nox-mesh plugin

Refuse paths with empty, dot or parent segments and a file that is also a
directory; take an item only when its key says what it is; write the view
under its lock; expand nodes all and check node names; merge the plugin's
entries into the operator's own; render every file past one that fails;
in the home, never take over the person's file, never write through a
symbolic link, keep a deleted file deleted, keep the kind's directory; and
refuse settings that would deny the console or the marketplace.

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

@@ -118,8 +118,19 @@ func Render(facts Facts, settings Settings, binding *Binding, helperPath string,
 	managed["attribution"] = map[string]any{"commit": "", "pr": ""}
 	managed["allowAllClaudeAiMcps"] = true
 	delete(managed, "apiKeyHelper")
+	// The plugin's marketplace and the plugin itself, as entries in the operator's own maps, the mesh's
+	// entry winning: the operator may know more marketplaces and enable more plugins.
 	for key, value := range MarketplaceKeys() {
-		managed[key] = value
+		entries := map[string]any{}
+		if held, ok := managed[key].(map[string]any); ok {
+			for k, v := range held {
+				entries[k] = v
+			}
+		}
+		for k, v := range value.(map[string]any) {
+			entries[k] = v
+		}
+		managed[key] = entries
 	}
 	if binding != nil && binding.Kind == "api-key" {
 		managed["apiKeyHelper"] = helperPath