chore: consolidate new foundation and archive v1 (#1495)

v1/packages/forge/examples/sample-brief.md

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+---
+class: technical
+---
+
+# Brief: Add User Preferences API Endpoint
+
+## Source PRD
+
+mosaic-stack PRD — Mission Control Dashboard
+
+## Scope
+
+Add a REST endpoint for storing and retrieving user dashboard preferences (layout, theme, sidebar state). This enables the Mission Control dashboard to persist user customization.
+
+## Success Criteria
+
+1. GET /api/users/:id/preferences returns stored preferences (JSON)
+2. PUT /api/users/:id/preferences stores/updates preferences
+3. Preferences persist across sessions
+4. Default preferences returned for users with no stored preferences
+5. Only the authenticated user can read/write their own preferences
+
+## Estimated Complexity
+
+Medium — new endpoint, new DB table, auth integration
+
+## Dependencies
+
+- Requires existing auth system (JWT guards)
+- Requires existing user entity in database