ADR-C-008: 9 files carried a CIBG-GAP EXTENSION marker against 8 register
rows. language-switcher had a well-formed marker and no row. Adds the row,
plus an optional ~14-line drift guard in check-tokens.sh that diffs the
marker set against the register and fails naming any missing row, so this
drift cannot silently reoccur.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
# Conflicts:
# docs/project/refactor-backlog-setup/refactor-backlog/99-backlog.md
eho
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