isProvablyObjectShapedRoot does not recognize $defs/$ref to typeless object-shaped schemas (e.g. named discriminatedUnion) #3094

In commit 5820f796 (#3081), isProvablyObjectShapedRoot in packages/core-internal/src/util/standardSchema.ts was updated to follow a same-document $ref into $defs / definitions, checking target?.type === 'object'.

When a $defs / definitions entry is a typeless object-shaped schema like z.discriminatedUnion('kind', [z.object(...), z.object(...)]).meta({ id: 'Result' }) (or a union/intersection of objects, or an object schema with properties that omits type: 'object'), target.type === 'object' returns false and wraps structuredContent in { result: ... }, even though the identical schema written inline without .meta({ id }) returns true.

Should isProvablyObjectShapedRoot also check isProvablyObjectShapedRoot(target, {}) when resolving a $ref target?

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