Make the test gate fail when no tests match

vitest.config.ts set passWithNoTests: true, added in the 7dd4abb
scaffolding commit when the repo genuinely had no tests yet. Once tests
existed it became the same hazard as the oxlint bugs fixed in 91f46ff:
if the include globs ever stopped matching, the suite would exit 0
having run nothing.

Vitest already defaults to failing in that case, so removing the line is
the whole fix — a broken glob now reports "No test files found, exiting
with code 1". Verified by pointing the globs at a nonexistent directory.

Extends the gate check to flag the option coming back, and renames it
from check-lint-gate to check-gates now that it covers more than oxlint.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

vitest.config.ts

@@ -3,7 +3,6 @@ import { defineConfig } from "vitest/config";
 export default defineConfig({
 	test: {
 		include: ["packages/*/src/**/*.test.ts", "apps/*/src/**/*.test.{ts,tsx}"],
-		passWithNoTests: true,
 		coverage: {
 			provider: "v8",
 			enabled: true,