Adopt pure entity trees

[alganet]

• Mapper::flush() resets pending queue on failure, preventing cascading errors across requests in long-running runtimes (Swoole, ReactPHP)
• Db::executeStatement() resets SQL state before execute, not after, so failures don't corrupt subsequent queries
• extractAndOperateCompositions() converts spec keys via Style::realProperty() to match DB column names after extractColumns() conversion
• Composite joins now emit explicit ON clauses instead of relying on implicit FK inference
• Composite entities no longer carry child PKs (commentId removed)
• checkNewIdentity() casts lastInsertId to int for typed properties
• Removed unused $parentCols parameter from insertCompositionChildren()
• All test stubs use typed properties and pure entity tree pattern

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.14815% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.68%. Comparing base (f0f0ba4) to head (686d92a).

Files with missing lines	Patch %	Lines
src/Mapper.php	98.03%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #109      +/-   ##
============================================
+ Coverage     98.32%   98.68%   +0.35%     
- Complexity      172      182      +10     
============================================
  Files             4        4              
  Lines           419      456      +37     
============================================
+ Hits            412      450      +38     
+ Misses            7        6       -1     

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[Copilot]

Pull request overview

This PR updates the ORM mapping behavior to support “pure entity tree” relationships (object references instead of FK scalar fields) and hardens runtime safety by ensuring internal mapper/DB state is reset after failures—important for long-running PHP runtimes (e.g., Swoole/ReactPHP).

Changes:

• Reset Mapper pending state on flush() failure; reset Db SQL state before executing statements.
• Rework composite handling: DB-column name normalization, explicit JOIN ... ON ... clauses, and composition child INSERT/UPDATE behavior.
• Update test stubs and mapper tests to use typed properties and pure entity tree relations (no embedded child PK fields).

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/Mapper.php	Adds reset-on-failure for flush(), reworks composite extraction/update, adds composition child inserts, normalizes extracted column keys, and adds explicit composite join ON clauses.
src/Db.php	Resets SQL builder state before statement execution to prevent cross-query contamination after failures.
tests/MapperTest.php	Adds/updates tests for pending reset, composite collision precedence, skipping cascades for uninitialized relations, and updated “id not initialized” assertions.
tests/Stubs/Postcomment.php	Converts stub to typed properties and pure entity tree relation (Author $author).
tests/Stubs/PostCategory.php	Converts to typed entity relations (Post $post, Category $category) instead of FK scalar fields.
tests/Stubs/Post.php	Converts to typed properties and replaces comment_id with Comment $comment.
tests/Stubs/OtherEntity/Post.php	Tightens typing and removes FK scalar handling in favor of Author $author.
tests/Stubs/OtherEntity/Comment.php	Converts FK scalar to relation (Post $post) and tightens typing.
tests/Stubs/OtherEntity/Author.php	Tightens typing for id/name accessors.
tests/Stubs/Issues.php	Changes id to typed int.
tests/Stubs/Issue.php	Changes id to typed int.
tests/Stubs/Improvement.php	Changes id to typed int.
tests/Stubs/Comment.php	Converts post to typed Post relation and tightens typing.
tests/Stubs/Category.php	Converts to typed properties and replaces category_id with Category $category relation.
tests/Stubs/Bug.php	Changes id to typed int.
tests/Stubs/Author.php	Changes id/name to typed non-nullable properties.

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