refactor: mark overriding methods with #[\Override]

[roxblnfk]

🔍 What was changed

• Methods that implement or override a parent method carry #[\Override], and Psalm now reports MissingOverrideAttribute instead of suppressing it. PHP 8.2 ignores the attribute, so no polyfill is needed.
• ClassMustBeFinal stays suppressed: making Worker, Environment or Logger final would break code that extends them.
• Dropped a @psalm-suppress on Logger::log() that no longer matched any issue. The one on the (string) cast in Environment::get() stays, because fromGlobals() passes $_SERVER, which holds non-string values despite the declared type.

Checklist

• How was this tested:
  • Psalm 6.20 at error level 1 reports no errors locally
  • All 88 Testo tests pass locally, the same count as on 3.x

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📥 Commits

Reviewing files that changed from the base of the PR and between eeec76c and be39954.

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📒 Files selected for processing (6)

• psalm.xml
• src/Environment.php
• src/Informer/Workers.php
• src/Logger.php
• src/Worker.php
• tests/Unit/Stub/TestRelay.php

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