Merge RB-32 — add the missing language-switcher row to the CIBG gap register

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

libs/shared/docs/cibg-gaps.mdx

@@ -31,6 +31,7 @@ placed above the `@Component` decorator, plus `parameters: { cibgGap: true }` an
 | `debug-state`                           | n/a                  | Dev-only tool, deliberately off-theme — see the component's own `ponytail:` note.                                                                      |
 | `status-badge`                          | n/a                  | Deliberate custom status dot, not Bootstrap's `.badge` (pill padding/colour don't fit).                                                                |
 | `placeholder-chip`                      | n/a                  | No vendored inline-chip/tag class.                                                                                                                     |
+| `language-switcher`                     | Taal instellen       | No vendored Huisstijl class ships for it; a small hand-rolled surface built from the token bridge.                                                     |
 
 Not a gap: `confirmation` renders entirely with vendored `.confirmation*` classes (no `styles:
 [...]` block) — its header comment names the pattern, no marker needed. The `upload/` suite