Add CMMI maturity level to compliance controls

Adds an optional CMMI 0-5 maturity level field to Control to support
ISO 27001 clause 9.1 effectiveness measurement and HITRUST CSF maturity
requirements. The field is nullable, framework-agnostic, and exposed
across all four API surfaces (GraphQL, MCP, CLI, n8n) plus the
generated SoA document.

Signed-off-by: Alejandro Juan <alejandrojuan@alejandrojuan.com>

packages/helpers/src/controls.ts

@@ -0,0 +1,43 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+type Translator = (s: string) => string;
+
+export const controlMaturityLevels = [
+    "NONE",
+    "INITIAL",
+    "MANAGED",
+    "DEFINED",
+    "QUANTITATIVELY_MANAGED",
+    "OPTIMIZING",
+] as const;
+
+export type ControlMaturityLevel = (typeof controlMaturityLevels)[number];
+
+export function getControlMaturityLevelLabel(__: Translator, level: string) {
+    switch (level) {
+        case "NONE":
+            return __("0 - None");
+        case "INITIAL":
+            return __("1 - Initial");
+        case "MANAGED":
+            return __("2 - Managed");
+        case "DEFINED":
+            return __("3 - Defined");
+        case "QUANTITATIVELY_MANAGED":
+            return __("4 - Quantitatively Managed");
+        case "OPTIMIZING":
+            return __("5 - Optimizing");
+    }
+}

packages/helpers/src/index.ts

@@ -51,6 +51,11 @@ export {
   documentWriteModes,
   getDocumentWriteModeLabel,
 } from "./documents";
+export {
+  controlMaturityLevels,
+  getControlMaturityLevelLabel,
+  type ControlMaturityLevel,
+} from "./controls";
 export { getAssetTypeVariant } from "./assets";
 export {
   getSnapshotTypeLabel,