Published QTI item with a namespace-prefixed root gets no xml:lang #6236

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Target branch: unstable

Observed behavior

set_qti_item_language (utils/assessment/qti/media.py) finds the item root with ITEM_ROOT_START_TAG_REGEX, which only matches an unprefixed <qti-assessment-item.
An item whose root is written with a namespace prefix (<q:qti-assessment-item) passes schema validation, then is written to the package without the node's language.

Expected behavior

The item root carries xml:lang set to the node's language, whichever namespace prefix the item used.

User-facing consequences

A channel mixing prefixed and unprefixed items publishes a QTI package where only some items declare a language.

Steps to reproduce

1. Store a type == qti item whose root is <q:qti-assessment-item xmlns:q="http://www.imsglobal.org/xsd/imsqtiasi_v3p0" ...>.
2. Publish a node with a language set.
3. Read items/<id>.xml from the QTI zip: the root has no xml:lang.

Context

• Noted as context in Published QTI item with a single-quoted xml:lang is written as malformed XML #6230, which fixes the single-quoted xml:lang case only.

AI usage

I used Claude Code to review the #6230 branch. It found this gap and reproduced it on upstream/unstable with set_qti_item_language directly.