Liam Ó Murchú reads Ó as a middle initial: add the Irish particles Ó, Ní, Ua (and Malay binti) #604

Rationale

Irish surnames are written with a separate patronymic particle: Ó/Ua ("descendant of"), Mac ("son of"), Ní/Nic ("daughter of"). mac is already in the particle vocabulary, but ó, ní and ua aren't. So the particle is read as a middle name and the surname loses its first word:

Liam Ó Murchú       → given Liam, middle Ó,  family Murchú
Sinéad Ní Mhurchú   → given Sinéad, middle Ní, family Mhurchú

Malay has the same shape with bin/binti ("son of"/"daughter of"). bin is a particle; binti isn't, so Ina binti Navalamar → middle binti, family Navalamar, while Hasim bin Hassan → family bin Hassan.

Found while reviewing NameAPI's published demo examples and its culture notes on Irish and Malay names.

Statement

• ó, ní and ua join PARTICLES as never-given particles. None is a standalone given name, so a name they open is surname-only, as with de Mesnil (rules.md#P1).
• binti joins as an ambiguous particle, like bin, because Binti is also a given name (Swahili, "daughter").
• Ó. written with a period stays an initial. The Irish particle is never written with a period, but Ó. is a real initial (Spanish Óscar, Icelandic Ólafur/Óskar/Ólöf). Today the particle match normalizes edge periods away, so ó in the vocabulary would also claim Ó.. The fix needs a particle that matches only when written bare. That's new: no one-letter particle has existed before, so nothing has needed it.

Examples (measured; "proposed" uses a temporary Lexicon.add)

The last two rows are the boundary the bare-only matching has to hold. They make good case-table rows, contrasted with Juan Ó Pérez.

Accepted consequences

• Bare Juan Ó Pérez (an Óscar initial written without its period) becomes family Ó Pérez. Accented initials normally carry the period, so this should be rare.
• Ó as a whole given name stops being possible in leading position. It isn't one in any culture I found.

Open questions

• Should ua be never-given or ambiguous? I found no given-name use, but checked less thoroughly than for ó/ní.
• Should binte (the Singapore spelling) come along with binti? I'd leave out the abbreviations bt/bte: two-letter words, and unreviewed.
• Interaction with Mc Donald and Ste Marie read the particle as the given name #360, which questions the never-given set's membership: these three would be its first additions since that issue was filed.

Exclusions

• nic: it's also an abbreviation of Nicolas/Nicole and a given name in its own right (Nic Cage). It belongs in an opt-in Irish pack, not the defaults.
• Unaccented O: Liam O Murchú is unchanged (middle O). Bare O is a common initial written without a period, and anglicized Irish names write O' glued to the name anyway (O'Neil already parses).

Same-PR obligations

rules.md P amendment for the bare-only boundary; a decisions.md#vocabulary-collisions application entry for the four words; case-table rows for each example, including the Ó. contrast.