Cache Assets Manager request state

[mehul0810]

Summary

• Cache selected Assets Manager options, cleaned query data, current object ID, and parsed asset source groups per request.
• Preserve the existing stored option shape and frontend asset enable/disable decisions.
• Add regression coverage for current-page disabled rules, current-page enabled exceptions, group-level source matching, and option-read reuse.

Validation

• php -l src/Modules/Assets/AssetsManager.php && php -l tests/bootstrap.php && php -l tests/unit-tests/tests-assets-manager.php
• ./vendor/bin/phpcs -s src/Modules/Assets/AssetsManager.php tests/bootstrap.php tests/unit-tests/tests-assets-manager.php
• composer phpstan
• composer test - 42 tests, 80 assertions
• git diff --check

Notes

• No UI source changed. Local browser/e2e smoke was not rerun in this environment because prior wp-env attempts are blocked by missing Docker (spawn docker ENOENT); GitHub CI remains the release-branch validation path for hosted smoke coverage.

Closes #105

[github-actions]

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