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Fix negative week numbers in yearly recurrences - #791

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bensynapse:fix-negative-yearly-week-numbers
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sabre-io:masterfrom
bensynapse:fix-negative-yearly-week-numbers

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I run Live Tennis API.

Fixes #621. Its example currently produces December 2028 after March 2026, then December 2030. It also loses the second weekday.

Negative week numbers now count back from the year's final ISO week. The iterator preserves yearly intervals across January and places Sunday at the end of its week. Years without the requested negative week are skipped, with the existing date limit bounding searches.

Eight regression cases fail before this fix. The existing negative-week test also needed its expected dates moved forward one week.

composer phpunit passes 1,824 tests on PHP 8.2 and 1,825 on PHP 8.5. Both versions pass composer phpstan. PHP CS Fixer and composer rector-check pass. The example calendar expands to the five expected events through 2030.

Both trees report the same 53 PHPUnit test-metadata deprecations.

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Yearly recurrence with negative BYWEEKNO

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