Clarify: nested bioghist is valid EAD — no code change needed

[Copilot]

An automated reviewer flagged nested <bioghist> elements as invalid EAD and suggested restructuring the injection logic to use siblings instead. This was incorrect.

Finding

Both EAD2002 and EAD3 explicitly permit <bioghist> as a child of <bioghist> — nesting is a standard pattern for grouping related biographical/historical notes. The current approach in get_creator_bioghist() + the injection block at main.py:284–293 produces valid EAD as-is.

No code changes are required. This PR documents the investigation and closes out the review thread.

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