DrRataplan / xq-lsp / 30017943522 / 1

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fix: predeclare xsi namespace prefix unconditionally

xsi (http://www.w3.org/2001/XMLSchema-instance) is one of the five
namespaces the XQuery 3.1 spec mandates as pre-declared in every
processor's static context (alongside xml, xs, fn, local), but it was
only registered under the eXist-db-specific runtime namespace list.
Any query using xsi:nil/xsi:type etc. without an explicit `declare
namespace xsi=...` got a false XQST0081 unless lib: ["existdb"] was
configured — a common pattern in XQuery Update Facility code (e.g.
`insert node attribute xsi:nil {"true"}`). This was the single
largest fixable false-positive cluster in the QT4 diagnostic coverage
snapshots.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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