feat: bootstrap design kit and vaporwave demo baseline

kit/docs/bible-skeleton/architecture/system-overview.md

@@ -0,0 +1,32 @@
+# System Overview
+
+## Product
+
+Describe the product in one paragraph.
+
+## Active Scope
+
+- List current in-scope modules/features
+- List user-visible surfaces
+- List operational responsibilities
+
+## Explicitly Removed / Out of Scope
+
+- List legacy or excluded modules to avoid accidental restoration
+
+## Runtime Composition
+
+- HTTP server package(s)
+- Domain/service orchestration
+- Persistence layer(s)
+- Migrations / background workers (if any)
+
+## Local Execution
+
+- `make run`
+- `go run ./cmd/<binary>`
+
+## Verification
+
+- `go test ./...`
+