MAINT: Enable ruff UP007/UP045 and modernise Optional/Union to PEP 604#1884

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Commits on Jun 1, 2026

MAINT: Enable ruff UP007/UP045 and modernise Optional/Union to PEP 604

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Commits on Jun 3, 2026

Merge branch 'main' into romanlutz/typing-modernization-audit

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Merge branch 'main' into romanlutz/typing-modernization-audit

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FIX: Convert remaining Optional[X] to X | None and add None guards

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