fix(search): tag only what the register records

The secondary row tested the admissions policy with includes('selective'),
which "Non-selective" passes, so every comprehensive (Burntwood, Graveney)
was tagged Selective. It now needs an exact "Selective".

Both rows excluded only "Does not apply" from the religious character, so a
school recorded as "None" got "Faith priority" (Putney High) or a bare
"None" chip (Abacus Belsize Primary). hasReligiousCharacter() treats both of
the register's no-faith values as no faith.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

nextjs-app/lib/utils.ts

@@ -902,6 +902,15 @@ export function isSpecialSchool(school: { school_type?: string | null }): boolea
   return /\bspecial\b/.test(t) || /pupil referral/.test(t) || /alternative provision/.test(t);
 }
 
+/**
+ * Whether GIAS records a religious character. "None" and "Does not apply" are
+ * the register's two ways of saying it has none, and neither is a faith.
+ */
+export function hasReligiousCharacter(value: string | null | undefined): boolean {
+  const v = value?.trim().toLowerCase() ?? '';
+  return v !== '' && v !== 'none' && v !== 'does not apply';
+}
+
 /**
  * The school's combined Reading, Writing & Maths figure, or null when there is
  * no real one to show.