[Bug]: Update on delegate child model fails with "missing FROM-clause entry" when entity mutation plugins are present

[genu]

Description
Updating a child model in a delegate hierarchy fails with a SQL error when an entity mutation plugin with an afterEntityMutation hook is registered. The error is:

• PostgreSQL: missing FROM-clause entry for table "Base"
• SQLite: no such column: Base.field

Additional context

When any plugin registers an afterEntityMutation hook, the query executor globally replaces RETURNING "id" with RETURNING * on all UPDATE/INSERT queries (zenstack-query-executor.ts:224-234). This causes the following chain of events during a child model update:

Steps to Reproduce

1. Define a delegate hierarchy where the base model has non-ID fields:

model Asset {
    id Int @id @default(autoincrement())
    organizationId String
    assetType String
    @@delegate(assetType)
}

model Product extends Asset {
    name String
}

2. Register any entity mutation plugin with an afterEntityMutation hook:

client.$use({
    id: 'my-plugin',
    onEntityMutation: {
        afterEntityMutation() {
            // even a noop triggers the bug
        },
    },
});

3. Create and then update a child entity with data that touches both base and child fields:

const group = await client.Post.create({
    data: { organizationId: 'org1', name: 'My Group' },
});

// This fails:
await client.Post.update({
    where: { id: group.id },
    data: { organizationId: 'org2', name: 'Updated Group' },
});

Notes

• The bug only triggers when the update includes child-specific fields (otherwise the child UPDATE is skipped entirely)
• The afterEntityMutation hook doesn't need to do anything — its mere presence causes RETURNING * globally via hasEntityMutationPluginsWithAfterMutationHooks
• Policy plugins are not required to reproduce the issue, though in practice users typically have both policy and entity mutation plugins active