feat: improve kernel runtime services

[brianvarskonst]

Summary

Splits kernel runtime responsibilities into focused collaborators, adds optional profiler debug bridging, normalizes mixed runtime metadata, and adopts shared QA tooling.

Checklist

• The change is focused and scoped to one concern.
• Tests or verification notes are included for behavior changes.
• Documentation was added or updated where needed.
• Public APIs, configuration keys, and contracts are described clearly.
• Backward compatibility impact is noted.

Type of Change

• Bug fix
• Feature
• Documentation
• Refactoring
• Maintenance
• Breaking change

Verification

• git diff --check origin/main...HEAD
• Not run locally: PHP/composer are not available in this shell; package CI should run the PHP QA commands.

Notes

Includes changelog notes for the runtime refactor and debug bridge. Branch is rebased on the existing PHP 8.5 main-branch update.

[brianvarskonst]

Reviewed the package-level diff and CI result. The runtime extraction, profiler bridge, Symfony 8.1 interface updates, and QA fixes are split into conventional commits, with GitHub Actions green after the final locator fix. No blocking findings.