Bug: Unnecessary foreign key for `Entity::$original`

[neznaika0]

Describe the bug
It seems we have an extra field/property after the query. The Entity::$original contains a foreign key: post_id, user_id..
In Relation::filterResults() Relation::filterResult(), we delete it, but there is no synchronization, unset from $attributes only.

codeigniter-nested-model/src/Relation.php

Lines 164 to 172 in cf01743

	$this->model
	->select(
	sprintf(
	'%s.*, %s.%s',
	$this->model->getTable(),
	$this->many->pivotTable,
	$this->many->pivotForeignKey,
	),
	)

To Reproduce
Output debug object:

 protected attributes -> array (5) [
 'id' => string (1) "1"
 'name' => string (18) "Baking for dummies"
 'total_hours' => string (2) "30"
 'created_at' => string (19) "2025-10-06 18:55:21"
 'updated_at' => string (19) "2025-10-06 18:55:21"
 ]
 protected original -> array (6) [
 'id' => string (1) "1"
 'name' => string (18) "Baking for dummies"
 'total_hours' => string (2) "30"
 'created_at' => string (19) "2025-10-06 18:55:21"
 'updated_at' => string (19) "2025-10-06 18:55:21"
 'student_id' => string (1) "1" // <<<
 ]

Expected behavior
Unnecessary properties are not needed.

Screenshots
No.

Environment (please complete the following information):

• PHP: PHP 8.4.13
• Version: dev-latest
• CodeIgniter: 4.6.3

Additional context
I tried to add synchronization to the right places, but it looks terrible. Maybe you know a better solution.
See also HasRelations::getDataForRelationByIds(), HasRelations::getDataForRelationById().
You can add array processing at the end of return $row->syncOriginal()

I think the object should be 100% synchronized after all the manipulations, because new values are being added.