fix(guides): add stub GUIDES export so build passes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/mana/apps/web/src/lib/modules/guides/index.ts

@@ -21,3 +21,7 @@ export type {
 
 export { GUIDE_CATEGORIES, DIFFICULTY_LABELS } from './types';
 export { guideTable, sectionTable, stepTable, runTable, GUIDES_GUEST_SEED } from './collections';
+
+// TODO: GUIDES should be populated from a content source (static JSON, CMS, or DB).
+// For now export an empty array so the /guides route renders without crashing the build.
+export const GUIDES: Guide[] = [];