Implement W3C XQuery Update Facility 3.0#6109

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joewiz wants to merge 7 commits intoeXist-db:developfrom

joewiz:feature/w3c-xquery-update-3.0

Commits on Mar 6, 2026

[feature] Add expression infrastructure for W3C XQuery Update Facility 3.0

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[feature] Implement W3C XQUF grammar, PUL, expression classes, and in-memory mutations

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[test] Add W3C XQUF JUnit tests and update XQSuite for new syntax

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[test] Migrate existing tests from proprietary to W3C update syntax

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[refactor] Remove old proprietary update implementation classes

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[test] Add XQUF performance benchmark

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[refactor] Address Codacy static analysis warnings

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