feat: bootstrap design kit and vaporwave demo baseline

kit/patterns/modal-workflows/README.md

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+# Modal Workflow Pattern
+
+This pattern package captures modal-based create/edit/remove workflows for server-rendered Go
+web UIs.
+
+Synthesis sources:
+
+- detailed enterprise UI interaction contracts
+- operational admin workflows in Go web apps

kit/patterns/modal-workflows/contract.md

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+# Contract: Modal Workflows
+
+## Shared Rules
+
+- Destructive actions require explicit confirmation.
+- Validation and backend errors are rendered in human-readable form.
+- UI state transitions are explicit (`open` / `submit` / `success` / `error` / `cancel`).
+- API contracts and UI copy should be documented in the host project's Bible.
+