Tariq Abdul Aziz: should a two-word surname like Abdul Aziz stay whole after the given name? #694

What happens today. A bound given-name word (rules.md#P5) joins the word after it only at the start of the name. Later in the name it is read as a middle name, in Latin script and native script alike:

Abdul Aziz Tariq       →  given 'Abdul Aziz', family 'Tariq'
Tariq Abdul Aziz       →  given 'Tariq', middle 'Abdul', family 'Aziz'
طارق عبد العزيز        →  given 'طارق', middle 'عبد', family 'العزيز'

Evidence. The native-script Wikidata corpus (#693) holds 150 real Arabic names that align. Every disagreement among them is this one shape, a two-word family name split across middle and family: 7 names, keyed in tools/differential/wikidata_native_agreement.json.

• طارق عبد العزيز
• سمر عبد العزيز
• نورس عبد الواحد
• عبد اللطيف عبد الحميد
• جميل عز الدين
• هالة شكر الله
• عائشة ذو الغنى

Only 4 of the 7 begin with a word in BOUND_GIVEN_NAMES (عبد). The others begin with عز, شكر and ذو. عز الدين and شكر الله are compounds whose SECOND word is the fixed part (الدين "of the religion", الله "God"). So there are two candidate mechanisms:

• (a) a bound word joins forward in any position, not only the first;
• (b) a word list of second elements (الدين, الله, الغنى) that join BACKWARD to the word before them.

Proposed statement, for (a). A bound given-name word that is not the name's first word joins the word after it, and the pair is placed by position like any one name word. So Tariq Abdul Aziz → family Abdul Aziz.

Boundaries to settle:

• Abdul Rahman Abdul Aziz → given Abdul Rahman, family Abdul Aziz.
• Muhammad Abdul (nothing to join) → family Abdul, as today.
• Family-first order: Abdul Aziz Tariq under FAMILY_FIRST → family Abdul Aziz.
• After a family comma: Abdul Aziz, Tariq already reads family Abdul Aziz; check it is unchanged.

Accepted consequences, if (a):

• A three-word name whose middle word is Abdul now reads it as part of the family. If Abdul Aziz were a second given name in a patronymic chain, that reading would be wrong.
• Nasab chains (X bin Abdul Aziz) need checking against P2's bin chain.

Open questions:

• Does (b) belong in the default vocabulary, or only in a future Arabic pack (see the v3 language-packs design notes)?
• Does the join in non-leading position need the same "a word to spare" reserve P5 uses?

Exclusions. The Persian (ییلاقی اشرفی) and Bulgarian (Цветков Дерменджиев) double surnames in the same record are a different shape: two family words with no bound word. They belong to the double-surname question, not this one.