docs(cli): name the filed issue for the one option-B site this card leaves alone

`plugins` / `devPlugins` are package-owned collections that `serve.ts` and
`schema-migration-plugins.ts` read off the top level only, and the mechanical
repair is wrong there: `packages[i].manifest.plugins` in a JSON artifact is inert
data where `kernel.use()` needs a live instance. Whether a live-object collection
belongs in the package-owned key set at all is a `packages/spec` question
upstream of every reader in this program, so the pin's header points at #15219
instead of at this card's report.

Part of #15006

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UHvF5hyiZjnCyExFnfQB8m

Author: claude

packages/cli/test/option-b-reader-acceptance.pin.test.ts

@@ -108,8 +108,10 @@
  * derivation every row here uses, and `serve.ts` / `schema-migration-plugins.ts`
  * read them off the top level only. The zoo declares none, so no row measures
  * them, and the fix is NOT mechanical: a JSON artifact's `packages[i].plugins`
- * would be inert data where the call site expects a live plugin instance. Filed
- * rather than folded in — see #15006's report.
+ * would be inert data where the call site expects a live plugin instance, and
+ * whether a live-object collection belongs in the package-owned key set at all is
+ * a `packages/spec` question upstream of every reader here. Filed as #15219
+ * rather than folded in.
  */
 
 import { mkdtempSync, rmSync } from 'node:fs';