test(relation): add relation feature tests

Add the test bootstrap files for the `relation` feature, mirroring the structure of the main `python-activerecord` project.

This ensures that the standardized relationship tests from the `rhosocial-activerecord-testsuite` are run against this backend, improving test coverage and consistency across the ecosystem.

Author: vistart

tests/rhosocial/activerecord_postgres_test/feature/relation/conftest.py

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+# tests/rhosocial/activerecord_postgres_test/feature/relation/conftest.py
+"""
+Pytest configuration for relation feature tests.
+
+This file imports fixtures from the corresponding testsuite, making them
+available to the tests in this directory.
+"""
+from rhosocial.activerecord.testsuite.feature.relation.conftest import *

tests/rhosocial/activerecord_postgres_test/feature/relation/test_base.py

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+"""
+Tests for relation base functionality.
+Imports tests from the standardized testsuite.
+"""
+from rhosocial.activerecord.testsuite.feature.relation.test_base import TestRelationDescriptor  # noqa: F401

tests/rhosocial/activerecord_postgres_test/feature/relation/test_cache.py

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+"""
+Test bridge for relation cache functionality.
+
+This test file runs the relation cache tests from the testsuite using the PostgreSQL backend.
+"""
+import pytest
+
+
+# Import the test classes from the testsuite
+from rhosocial.activerecord.testsuite.feature.relation.test_cache import TestRelationCache
+
+
+# This will cause pytest to run all the tests in the imported class
+# The tests will use the fixtures and providers configured in conftest.py

tests/rhosocial/activerecord_postgres_test/feature/relation/test_descriptors.py

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+"""
+Tests for relation descriptor functionality.
+Imports tests from the standardized testsuite.
+"""
+from rhosocial.activerecord.testsuite.feature.relation.test_descriptors import TestRelationDescriptors  # noqa: F401

tests/rhosocial/activerecord_postgres_test/feature/relation/test_interfaces.py

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+"""
+Tests for relation interfaces.
+Imports tests from the standardized testsuite.
+"""
+from rhosocial.activerecord.testsuite.feature.relation.test_interfaces import TestRelationInterfaces  # noqa: F401

tests/rhosocial/activerecord_postgres_test/feature/relation/test_nested_relationship_access.py

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+"""
+Tests for nested relationship access functionality.
+Imports tests from the standardized testsuite.
+"""
+from rhosocial.activerecord.testsuite.feature.relation.test_nested_relationship_access import TestNestedRelationshipAccess  # noqa: F401