id: PORT-004
title: Hashed Workspace Persistence
status: done
priority: P0
effort: L
depends_on:
  - PORT-001
summary: Workspace-scoped URLs and server-side persistence now drive the product state model.
completed_notes:
  - / is a welcome/bootstrap page.
  - Workspace routes exist for overview, settings, hedge, backtests, and event comparison.
  - Cookie stores only workspace_id.