refactor: mark overriding methods with #[\Override]

[roxblnfk]

Q	A
Bugfix?	❌
Breaks BC?	❌
New feature?	❌
Issues	—

• Methods that implement an interface method carry #[\Override], and Psalm now reports MissingOverrideAttribute instead of suppressing it. PHP 8.2 ignores the attribute, so no polyfill is needed.

• The InvalidOperand suppression is gone too: an int|float TTL is cast to float before it is scaled to microseconds. The redundant round() on the integral DateInterval product is dropped. Behaviour is unchanged.

• psalm.xml has no issue handlers left.

• How was this tested:

  • Psalm at error level 1 reports no errors locally
  • Testo: 56 passed, 2 skipped, the same as on 1.x
  • Infection: covered MSI 94% (2 equivalent escaped mutants), above the 90% gate

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