Failed tests lose all artifacts when retries are enabled #5689

Bug

With retry enabled every failed test ends up with empty test.artifacts — screenshot/video are lost, reporters get nothing to upload.
Console shows TypeError: originalTest.artifacts is not iterable for each retried test.

Root cause

1. lib/listener/retryEnhancer.js copies artifacts with array spread [...originalTest.artifacts], but artifacts is an object map ({screenshot: path}). The spread throws, copyCodeceptJSProperties aborts mid-loop and the retried test never gets enhanceMochaTest() — so the retried attempt can't record artifacts either.
2. screencast plugin's ensureArtifactsObject() replaces array-shaped artifacts with {}, dropping the screenshot key already written by the screenshot plugin.

Repro

4.0.8 and 4.1.0: Playwright helper + plugins screenshot and screencast (on=fail) + retry: 1. Any failing test → TypeError in console, no screenshot saved, empty artifacts in report.