feat: bootstrap design kit and vaporwave demo baseline

kit/patterns/theme-aqua-legacy/notes.md

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+# Aqua Legacy Snapshot Notes
+
+This snapshot is kept for historical reference and selective reuse.
+
+## What it captures
+
+- Aqua-style control surfaces and button hierarchy
+- segmented controls and tab-like grouped buttons
+- modal window chrome experiments (titlebar + close button)
+- table/filter visual refinements and dot-pager styling
+- style-playground Aqua preset refinements
+
+## What it is not
+
+- Not a required dependency for host projects
+- Not the live source of truth for the current Aqua baseline (the live baseline is in demo/scaffold CSS)
+- Not the target for normal iterative styling work unless explicitly requested
+
+## Current policy
+
+- Active baseline styling remains Aqua-first in the live demo/scaffold assets.
+- Use this snapshot only when explicitly needed for archival comparison or extraction.