Bootstrap project and safe work-item workflow

delivery_backlog/stories/US02-05-frontend-shell.md

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+# US02-05 — Build the Static Application Shell
+
+Epic: [E02](../E02-unified-workflow-shell.md)
+
+As a user, I want a fast, navigable application shell so all workflow views share one
+consistent interface without server-generated operational HTML.
+
+## Acceptance criteria
+
+- `index.html`, CSS, and modular JavaScript are separate static files.
+- Shared API client, store, router, error handling, cancellation, and SSE/polling
+  adapters are implemented.
+- Navigation routes restore current view and filters after reload.
+- HTML fallback never intercepts `/api/v1` requests.
+
+## Automated tests
+
+- JavaScript tests cover API errors, store transitions, routing, and event fallback.
+- Browser tests assert asset loading, deep links, reload, JSON-only APIs, and no
+  unexpected console/network errors.
+
+## Dependencies
+
+- US02-04