Remove stdClass support, enable pure entity trees

[alganet]

Drop stdClass as entity fallback — EntityFactory now throws DomainException for unknown classes. Remove dynamic property fallbacks from set/get/extractProperties, eliminate persistableCache and reflectPersistable().

Add EntityFactory::extractColumns() to derive FK values from entity object properties (e.g. $author -> author_id).

Rewrite wireRelationships to use collection-tree parent matching instead of FK property scanning. Update resolveEntityName to accept object|array for Nested hydrator compatibility.

Entity stubs use pure entity trees: relation properties ($post, $author) replace FK scalars ($post_id, $author_id). Remove redundant tests, add extractColumns unit coverage.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.45%. Comparing base (169cf0b) to head (b3cff76).

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #22      +/-   ##
============================================
+ Coverage     97.58%   98.45%   +0.86%     
+ Complexity      206      204       -2     
============================================
  Files            16       16              
  Lines           456      453       -3     
============================================
+ Hits            445      446       +1     
+ Misses           11        7       -4     

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[Copilot]

Pull request overview

This PR removes stdClass as a fallback entity type and shifts hydration/persistence toward “pure entity trees” where relationships are represented by object properties (e.g. $post->author) and persisted via derived FK columns (e.g. author_id).

Changes:

• Make EntityFactory::createByName() throw for unknown entity classes (no stdClass fallback) and remove dynamic property set/get behavior.
• Add EntityFactory::extractColumns() to convert relation-object properties into FK columns for persistence.
• Update hydrators/collections/tests to support array-based typed discrimination and collection-tree-based relationship wiring.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/Stubs/Post.php	Adds Post stub for pure entity-tree relationship modeling.
tests/Stubs/Issue.php	Adds Issue stub for typed entity hydration tests.
tests/Stubs/Foo.php	Adds Foo stub used as a generic entity in tests (replacing stdClass).
tests/Stubs/Comment.php	Adds Comment stub using relation property (post) instead of FK scalar.
tests/Stubs/Category.php	Adds Category stub for test fixtures.
tests/Stubs/Bug.php	Adds Bug stub for typed discriminator hydration tests.
tests/Stubs/Author.php	Adds Author stub for relationship and persistence tests.
tests/InMemoryMapper.php	Switches persistence extraction from properties to derived columns (extractColumns).
tests/Hydrators/NestedTest.php	Updates Nested hydrator tests to use stub namespace + typed entities without stdClass.
tests/Hydrators/FlatTest.php	Updates Flat hydrator typed-entity test to use stubs instead of stdClass.
tests/EntityFactoryTest.php	Updates expectations for unknown entities (exception) and adds extractColumns unit coverage.
tests/Collections/TypedTest.php	Updates typed discriminator tests to use array rows (no stdClass).
tests/Collections/CollectionTest.php	Replaces stdClass usage with stub entity instances.
tests/AbstractMapperTest.php	Reworks relationship wiring assertions for pure entity trees and updates mapper setup to use stubs.
src/Hydrators/Nested.php	Passes raw array into resolveEntityName() for Nested hydration compatibility.
src/Hydrators/Base.php	Replaces FK-scanning wiring with collection-tree parent matching.
src/EntityFactory.php	Removes stdClass fallback + dynamic props, adds extractColumns(), updates extraction/hydration logic.
src/Collections/Typed.php	Allows resolveEntityName() to accept `object
src/Collections/Collection.php	Updates resolveEntityName() signature to accept `object

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