spec: finalize wealth-ledger SDD migration

openspec/schemas/wealth-ledger-sdd-v2/templates/design.md

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+# Engineering Design
+
+## Context and Constraints
+
+## Technical Goals / Non-Goals
+
+## Implementation Impact Map
+
+### main
+
+### frontend
+
+### backend
+
+### qa
+<!-- Use only after a real QA/E2E repository exists. -->
+
+## Decisions
+
+### main
+
+### frontend
+
+### backend
+
+### qa
+
+## Cross-cutting Implementation
+
+## Data / Storage Changes
+
+## Contract Implementation
+
+## Developer Verification Strategy
+
+## UI/UX Package
+
+<!-- Choose new/changed, reuse or N/A with reason. For applicable UI include
+     package revision, screens, states, interactions, responsive/a11y behavior.
+     For reuse give immutable store ID + path from OpenSpec root, reused part
+     and differences. Keep materials accessible after archive. Inline Markdown
+     needs no self-hash; mutable external-only URLs are not an approved package. -->
+
+**Applicability and scope:**
+
+**Package revision:**
+
+**Screens, states and interactions:**
+
+**Responsive behavior:**
+
+**Reused source and differences:**
+
+<!-- If local PNG/SVG exports are needed, list each under visuals/ with a
+     relative path, purpose and SHA-256. SVG must be self-contained (no scripts,
+     handlers, external fonts/assets). Otherwise remove the table and state
+     that the package is fully inline. One Design approval covers all materials. -->
+
+| Material ID | Relative path | Screen/state and purpose | SHA-256 |
+| --- | --- | --- | --- |
+| <!-- id --> | <!-- visuals/file.png --> | <!-- purpose --> | <!-- digest --> |
+
+## Risks / Trade-offs
+
+## Migration / Rollout / Rollback
+
+## Solution Assessment