Add Vapor shell palette presets and contract docs

CHANGELOG.md

@@ -13,9 +13,13 @@ All notable changes to the public design kit surface are documented here.
 - Design single-source index: `bible/architecture/design-canon-map.md`
 - Active reusable Vapor theme module in `kit/patterns/theme-vapor` (CSS + icon sprite)
 - New export bundle: `ui-theme-vapor`
+- Vapor shell palette catalog with 9 preset IDs for header/accent colors and tokenized shell height
+  (`kit/patterns/theme-vapor/palette-catalog.md`)
 
 ### Changed
 
 - Canonical baseline docs aligned to `Vapor Soft` / `Vapor Night` as active demo/scaffold style.
 - Aqua module/docs clarified as legacy archive/reference (not active baseline).
 - Table-management docs clarified as theme-agnostic geometry/semantics contract.
+- Vapor shell CSS now supports reusable preset selection via `data-vapor-shell` and shared
+  `--shell-*` tokens across default, auto-dark, and explicit `data-theme` modes.