feat: promote to Senior Technical Consultant and use British spelling

Update the current role to Senior Technical Consultant (AI & Data) from
October 2026, close out the previous Technical Consultant entry, and
convert site copy to British spelling.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

src/portfolio/sections/CurrentWork.tsx

@@ -9,8 +9,8 @@ const RoleInfo = (): JSX.Element => {
 	return (
 		<div className={styles.roleInfo}>
 			<h3>{currentWorkData.role}</h3>
-			<p className={styles.specialization}>
-				Specializing in <strong>{currentWorkData.specialization}</strong>
+			<p className={styles.specialisation}>
+				Specialising in <strong>{currentWorkData.specialisation}</strong>
 			</p>
 			<p className={styles.company}>
 				at{" "}