test(runtime): the dispatcher envelope check uses the shared predicate (#4090 follow-up)

[os-zhuang]

The caller that motivated #4090's extraction, now actually using it. One file, one test body.

Why this isn't cosmetic

domain-handler-registry.test.ts hand-rolled "no key beside the envelope's own may hold the payload" when I wrote it for #4038. #4090 promoted that rule into envelopeViolations precisely so it would stop having two definitions. Leaving the local copy in place would have recreated the failure this whole line has been closing — one rule, two places, and only one of them updated next time.

It also wasn't the same rule. The local version was:

const ENVELOPE_KEYS = new Set(['success', 'data', 'meta']);
for (const key of Object.keys(body ?? {})) {
  expect(ENVELOPE_KEYS.has(key), …).toBe(true);
}

That passes any body whose top-level keys fall in the set — including a success body with no data at all, and one carrying an error alongside success: true. The shared predicate rejects both.

Verified as a strict improvement, not a refactor

I broke the producer two ways and checked the suite catches each:

injected body	old local check	shared predicate
{ success: true, data: link, link } (the #4049 drift)	caught	caught
{ success: true } (no payload)	passed ❌	caught ✅

Both now fail the suite; the second is the one that used to slip through.

Verification

@objectstack/runtime 914 passed. All ten gates in the TypeScript Type Check job, plus the six check:* guards — 16 total, all green.

Stale-dist note, worth recording because it cost me a round and reads as a real failure. After restarting this branch onto the newer main, two gates failed against a stale packages/spec/dist:

• check:api-surface reported - strictUnknownKeyError, + AggregationFunction … "3 breaking, 8 added" — other people's exports, because the built .d.ts predated their commits.
• check:i18n-coverage rejected examples/app-showcase/objectstack.config.ts for a 'combo' chart type — which the fresh spec allows.

Neither is a real failure and neither is mine; rebuilding spec cleared both, and I confirmed the i18n one passes identically with and without my change. Related: gen:api-surface reads dist/index.d.ts, so it cannot run under OS_SKIP_DTS=1 at all.

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Project	Deployment	Actions	Updated (UTC)
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📓 Docs Drift Check

No hand-written docs reference the 0 changed package(s). ✅