docs: add unified field naming entry to ROADMAP.md

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

ROADMAP.md

@@ -126,6 +126,7 @@ This strategy ensures rapid iteration while maintaining a clear path to producti
 | CI lint rule rejecting new `z.any()` | 🔴 | Planned — eslint or custom lint rule to block `z.any()` additions |
 | Dispatcher async `getService` bug fix | ✅ | All `getService`/`getObjectQLService` calls in `http-dispatcher.ts` now properly `await` async service factories. Covers `handleAnalytics`, `handleAuth`, `handleStorage`, `handleAutomation`, `handleMetadata`, `handleUi`, `handlePackages`. All 7 framework adapters (Express, Fastify, Hono, Next.js, SvelteKit, NestJS, Nuxt) updated to use `getServiceAsync()` for auth service resolution. |
 | Analytics `getMetadata` → `getMeta` naming fix | ✅ | `handleAnalytics` in `http-dispatcher.ts` called `getMetadata({ request })` which didn't match the `IAnalyticsService` contract (`getMeta(cubeName?: string)`). Renamed to `getMeta()` and aligned call signature. Updated test mocks accordingly. |
+| Unified ID/audit/tenant field naming | ✅ | Eliminated `_id`/`modified_at`/`modified_by`/`space_id` from protocol layer. All protocol code uses `id`, `updated_at`, `updated_by`, `tenant_id` per `SystemFieldName`. Storage-layer (NoSQL driver internals) retains `_id` for MongoDB/Mingo compat. |
 
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