fix(gui): CI gate repairs — docs, coverage, HMR re-registration

Regenerate the module-graph/config-catalog/event-graph docs for the
locale rename and new packages; allowlist the three settings READMEs;
complete the RFC code block and add its English pair. Cover the
ThemeService media-query paths (stubbed matchMedia) and mark the
unreachable registry fallback. General section re-registration now
judges presence on the slot ledger instead of a local disposer, which
went stale when an HMR collapse removed the entry.

packages/client/ui-theme/src/client/index.ts

@@ -157,6 +157,7 @@ export class ThemeService {
       : this.preference
     // Both built-ins always exist; a registered preference id resolves or has
     // been reset by its disposer, so the lookup cannot miss.
+    /* v8 ignore next -- the ?? arm needs a registry without light/dark, which register()/dispose() cannot produce */
     const active = this.themes.find(t => t.id === resolvedId) ?? this.themes[0]!
     return Object.freeze({
       preference: this.preference,