feat: compose the portfolio journey layer

src/content/types.ts

@@ -8,6 +8,16 @@ export type SectionId =
   | 'toolkit'
   | 'contact';
 
+export type SectionLayout =
+  | 'hero'
+  | 'right-rail'
+  | 'left-timeline'
+  | 'full-diagram'
+  | 'project-stage'
+  | 'compact-rail'
+  | 'toolkit-field'
+  | 'destination';
+
 export type ProjectVisibility = 'public' | 'private';
 export type ProjectMaturity = 'learning' | 'experimental' | 'prototype' | 'work-in-progress' | 'active';