[wieslawsoltes]

Problem

The first #863 fix made Document.createRange() honor the receiver document, but unchanged Code OSS still raised WrongDocumentError from Monaco's _detachRange(). Monaco's _textRangeRestingSpot is created with document.createElement('div') and deliberately never connected, while WebScene used ancestor connectivity as document ownership.

Change

• retain the creating Document root for nodes produced by Document factories and imported/contextual fragments;
• validate Range endpoints using retained document identity as well as live ancestry;
• return the correct ownerDocument for detached nodes created by detached documents and iframe documents;
• discard ownership records with detached-subtree collection and navigation teardown;
• extend the Keep Range endpoints owned by the creating document during Monaco layout #863 native regression with Monaco's exact never-connected resting-node sequence and a detached cross-document rejection.

No style, layout, scene publication, timer, or VS Code source behavior is changed.

Focused validation

Release native target built successfully with the current V8 configuration.

WEBSCENE_NATIVE_ENGINE_TEST_FILTER=range-document-owner webscene_native_engine_tests
Range document-owner reuse gate: cycles=10000 durationMs=2.94804096221924

Closes #863.