Surface the text-merge update path's limitation rather than silently no-op:
when contact_data['email'] or ['tel'] arrives as a dict/list on update, log a
warning at the top of _merge_vcard_properties pointing callers at plain str
or create_contact. Existing EMAIL/TEL lines are still preserved unchanged.
Bring nc_contacts_update_contact docstring into parity with create — the
update tool now documents the same keys plus the explicit single-string
limitation for email/tel and the BDAY validation / URL first-only behaviours.
Three new TestMergeVcardProperties cases pin the warning: dict email warns,
list tel warns, plain str email is silent (no false positives).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
