_insert_missing_ipa now removes garbled phonetic text (e.g. "skea",
"sku:l", "'sizaz") that follows the inserted IPA bracket. Keeps
delimiters (–, -), uppercase words (German), and known English words.
Fixes: "scare [skˈɛə] skea" → "scare [skˈɛə]"
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>