Add RefersToMorphed relation attribute

[roxblnfk]

Add the #[RefersToMorphed] (and @RefersToMorphed) attribute, the morphed
counterpart of RefersTo, mirroring BelongsToMorphed. It compiles to the
refersToMorphed relation type and allows self-linked / cyclic morphed
references that BelongsToMorphed cannot persist in a single transaction.

Adds functional tests across all four drivers verifying the relation is
generated as Relation::REFERS_TO_MORPHED with the morph and inner key columns.

Requires cycle/orm with Relation::REFERS_TO_MORPHED and cycle/schema-builder
with the refersToMorphed schema generator.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.93%. Comparing base (4c15bdd) to head (a5aa920).

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x     #123      +/-   ##
============================================
+ Coverage     91.90%   91.93%   +0.02%     
- Complexity      329      330       +1     
============================================
  Files            38       39       +1     
  Lines           840      843       +3     
============================================
+ Hits            772      775       +3     
  Misses           68       68              

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[Copilot]

Pull request overview

Adds a new morphed relation attribute #[RefersToMorphed] (and @RefersToMorphed) to generate Cycle ORM relations of type Relation::REFERS_TO_MORPHED, enabling deferred/self-referential morphed references. Includes new functional tests (per driver) plus fixtures to validate the generated relation type and expected morph/inner key columns, and bumps required package versions to pick up the underlying ORM/schema-builder support.

Changes:

• Introduces Cycle\Annotated\Annotation\Relation\Morphed\RefersToMorphed relation attribute/annotation.
• Adds cross-driver functional coverage + fixtures to assert the compiled schema produces REFERS_TO_MORPHED with *_id and *_role columns.
• Updates PhpStorm meta-storm relations metadata and bumps composer dependency constraints.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Annotation/Relation/Morphed/RefersToMorphed.php	Adds the new morphed relation attribute/annotation class compiling to refersToMorphed.
tests/Annotated/Functional/Driver/Common/Relation/Morphed/RefersToMorphedTestCase.php	Common functional assertion that the schema contains a REFERS_TO_MORPHED relation and expected columns.
tests/Annotated/Functional/Driver/MySQL/Relation/Morphed/RefersToMorphedTest.php	MySQL driver wrapper for the common test case.
tests/Annotated/Functional/Driver/Postgres/Relation/Morphed/RefersToMorphedTest.php	Postgres driver wrapper for the common test case.
tests/Annotated/Functional/Driver/SQLite/Relation/Morphed/RefersToMorphedTest.php	SQLite driver wrapper for the common test case.
tests/Annotated/Functional/Driver/SQLServer/Relation/Morphed/RefersToMorphedTest.php	SQLServer driver wrapper for the common test case.
tests/Annotated/Fixtures/RefersToMorphed/Comment.php	Fixture entity defining the RefersToMorphed relation.
tests/Annotated/Fixtures/RefersToMorphed/Post.php	Fixture entity implementing the morphed parent interface.
tests/Annotated/Fixtures/RefersToMorphed/MorphedParentInterface.php	Fixture interface used as the morphed target contract.
resources/relations.meta-storm.xml	Adds PhpStorm meta-storm constructor argument hints for RefersToMorphed.
composer.json	Updates dependency constraints to versions expected to support REFERS_TO_MORPHED and related generators.

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