test(rest): pay down the one annotation-reachable error of rest.test.ts's four, and measure the other three

packages/rest/src/rest.test.ts

@@ -2,7 +2,7 @@
 
 import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
 import ExcelJS from 'exceljs';
-import { RouteManager, RouteGroupBuilder } from './route-manager';
+import { RouteManager } from './route-manager';
 import { RestServer, mapDataError } from './rest-server';
 import { createRestApiPlugin } from './rest-api-plugin';
 import type { RestApiPluginConfig } from './rest-api-plugin';

packages/rest/test-typecheck-debt.json

@@ -1,8 +1,9 @@
 {
   "_comment": "Per-file tsc error debt of the @objectstack/rest TEST layer (#5286). `tsconfig.test.json` compiles `src/**/*.test.ts` — which `tsconfig.json` excludes and therefore no gate ever read — and every file below still carries errors from before that gate existed. THIS FIELD IS GENERATED: every regeneration rewrites it from scripts/check-test-typecheck.mts, and the EXACT ratchet below requires a regeneration on every repair — so an edit made here is gone by the next one. Anything true of THIS package goes in the sibling `_note` field, which is authored, is preserved verbatim, and is never written by the generator (#12624). This comment states NO cause for the errors, deliberately: the classes differ per package and per file, they move as the debt is paid down, and a cause written here is rewritten verbatim into every ledger by every regeneration — so it outlives its own repair and cannot be corrected in the file where it is read. Measure instead, before repairing anything: `tsc --noEmit --pretty false -p tsconfig.test.json` in the package prints the real classes with their TS codes. EXACT ratchet, judged by re-running tsc: a file that gains errors is red, a file that loses them is red until its number is re-recorded, a file that reaches zero is red until its entry is deleted, and a file NOT listed here may have no errors at all. Regenerate with: pnpm --filter @objectstack/rest gen:test-typecheck-debt",
+  "_note": "Everything still recorded here is held by its own card, and none of it is an annotation repair. #13377 holds the request literals this package builds by hand against IHttpRequest, which omit members that interface requires. #13378 holds the exceljs call whose parameter type resolves to that package's own module-local Buffer declaration rather than Node's. Repairing either one here would mean changing a fixture's data, or adding an assertion this package's paydown rules out, so these entries shrink when those cards land and not before.",
   "entries": {
     "src/meta-public-book-grant.test.ts": 1,
     "src/rest-batch-size-cap.test.ts": 1,
-    "src/rest.test.ts": 4
+    "src/rest.test.ts": 3
   }
 }