Reserved names: a display name is the owner's only as their handle, or with honorifics #880

Follow-up to #848, from its review (verdicts/848.md).

A display name is where real names live. Until now an admin called maria made "Maria Garcia" a reserved display name, because the owner's handle counted as any word. Now:

• Usernames are held to the whole rule, unchanged.
• Display names count as the owner's only when they are the handle itself after folding ("MARIA"), or the handle with nothing but honorific or role words around it, spaced or run together: "the real maria", "Maria official", "realmaria", "Maria (admin)".
• Crew names are unchanged: a crew name beside a role word is refused either way.

reservedName takes as: "username" | "display", and updateProfile asks with "display".

Tests: test/reserved-names.test.ts. With an admin maria, "Maria Garcia", "Anna Maria" and "Mariah Carey" are free display names. "MARIA", "the real maria", "Maria official", "realmaria" and "Maria (admin)" are refused. The case fails on main.

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