Adds EnrichItem(objectId, iconId, name, type) — enriches an existing
stub created from PlayerDescription with the fuller data carried by its
CreateObject message. Returns false when the item isn't tracked yet
(phase 1: enrich-existing only). Raises ItemPropertiesUpdated on success
so bound widgets (the toolbar) re-render.
Two xUnit tests: enrich-existing updates IconId/Name/raises event (true),
unknown-id returns false.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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