fix(lint): the validateFilterTokens registration comment states the runtime's refusal

The comment above the rule's registration in authoring-rules.ts said an
unresolvable filter placeholder reaches the data engine as a literal, matches
nothing, and the surface renders empty with no error. The data engine refuses
such a query (FILTER_TOKEN_UNKNOWN, 400). The comment now says so and keeps
the silent-zero history it was written against, in the past tense.

Claude-Session: https://claude.ai/code/session_019oFY6Hi35J7atvgVFnmoaK
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/lint/src/authoring-rules.ts

@@ -914,9 +914,10 @@ export const AUTHORING_RULES: readonly AuthoringRule[] = [
       'saves, a rollout decision over stored tenant rows the in-repo corpus does not measure.',
     run: (stack) => validateDashboardWidgetOptions(stack),
   },
-  // #3574 — a filter value like `{current_user}` resolves in no vocabulary,
-  // reaches the data engine as a literal and matches nothing. The surface
-  // renders empty with no error, and a silent zero is indistinguishable from a
+  // #3574 — a filter value like `{current_user}` resolves in no vocabulary. The
+  // data engine refuses a query carrying it (`FILTER_TOKEN_UNKNOWN`, 400). When
+  // #3574 was filed it reached the engine as a literal and matched nothing: the
+  // surface rendered empty with no error, a silent zero indistinguishable from a
   // genuine one at review time.
   {
     name: 'validateFilterTokens',