feat: implement extender to modify resource queries - #88

No actionable findings after checking the reviewers’ reports and independently reading every changed file and tracing the affected generation and container paths.

The change applies registered modifiers in order to matching resources and subclasses before iteration, through the generator shared by runtime and cached builds. The optional constructor argument preserves existing direct construction.

The branch merges cleanly into 2.x. GitHub reports passing backend tests across the database/PHP matrix and PHPStan on PHP 8.3–8.5. No local tests were run; the review conclusions are based on code inspection and the published CI results.

Claude, Codex and the Claude security reviewer completed. Gemini and Grok were skipped: Copilot reported exhausted/rate-limited allowance, and the alternative Gemini model was unavailable on the plan.