docs(client): packages.list says the manifest index signature is the accepted static contract

The packages.list TSDoc called the type/runtime asymmetry a known gap
tracked on an open card and cited a stale stack.zod.ts line. The card
was ruled the other way: the index signature on the record-stage body
is the accepted static contract, the runtime Zod schema is the enforced
one, and the A2 form is recorded beside RecordStagePackageBodySchema for
the day the schema depth allows it. The paragraph now says so and cites
the schema by name. Comment text only.

Claude-Session: https://claude.ai/code/session_01QcAS3qiYYZNezaxZxaUdMV
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/client/src/index.ts

@@ -2513,14 +2513,19 @@ export class ObjectStackClient {
      * as either stage, which is the right answer for it — the key such a guess
      * would read is not there.)
      *
-     * ⚠️ The RUNTIME half is the strict one, and the asymmetry is a KNOWN GAP
-     * rather than a design: `InstalledPackageAtEitherStageSchema.safeParse()`
-     * refuses a `manifest` belonging to neither stage, while that same row
-     * COMPILES against this declaration. Tracked as #19324, whose root cause is
-     * the deliberate `z.ZodType<Record<string, unknown>, …>` annotation at
-     * `packages/spec/src/stack.zod.ts:1283` (#14513 — TS7056 and a
-     * declaration-chunk ceiling); ⛔ not something this declaration can fix, and
-     * ⛔ not a licence to relax either runtime branch to match the type.
+     * ⚠️ The RUNTIME half is the strict one, and the asymmetry is the ACCEPTED
+     * static contract, not a gap waiting to close:
+     * `InstalledPackageAtEitherStageSchema.safeParse()` refuses a `manifest`
+     * belonging to neither stage, while that same row COMPILES against this
+     * declaration. The index signature comes from the deliberate
+     * `z.ZodType<Record<string, unknown>, …>` annotation on
+     * `RecordStagePackageBodySchema` in `@objectstack/spec` (the #14513 pattern —
+     * TS7056 and a declaration-chunk ceiling), and the maintainer ruled on
+     * #19324 (letter 丙) to keep it: the runtime Zod schema is the enforced
+     * contract, so narrow by parsing, as above. The precise form, A2, is
+     * recorded beside `RecordStagePackageBodySchema` for the day the schema
+     * depth allows it. ⛔ Not something this declaration can fix, and ⛔ not a
+     * licence to relax either runtime branch to match the type.
      */
     list: async (filters?: { status?: string; type?: string; enabled?: boolean }): Promise<{ packages: InstalledPackageAtEitherStage[]; total: number }> => {
         const route = this.getRoute('packages');