docs(lint): name the filed issue beside the generic-task limb this gate leaves out

The header stated the deliberate omission and its live violation
(`test:e2e`, held by zero of 78 packages) but had nothing to point at.

Part of #12046

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UjM2ia8Av1v5NqfqQEQmC6

Author: claude

scripts/check-turbo-task-graph.mjs

@@ -82,8 +82,8 @@
  * `examples/app-showcase` is spelled `test:smoke`, which turbo.json does not
  * configure at all. Closing that needs an edit to `turbo.json`, which is not
  * this card's file surface, and a gate that ships red is worse than no gate.
- * Filed separately; widen this gate's population to generic keys in the same
- * change that fixes the entry, not before.
+ * Filed as #12373; widen this gate's population to generic keys in the same
+ * change that fixes that entry, not before.
  *
  * ## Refusals, never quiet passes (#4690)
  *