## Summary

- remove the standalone Research Workspace and its special chat-reference surface - remove Background Work from product navigation while retaining compatibility internals - preserve inline research creation and ordinary child-document navigation - harden retained-route loading, archive restoration, and child focus lifecycle integration

## Verification

- bun run fix - bun test — 1361 passed, 2 PostgreSQL-only skips - bun run types - bun run ci - git diff --check - affected E2E suites — 51 tests passed in the combined four-worker run; the one load-sensitive shifted-visual-viewport fixture passed on its exact isolated rerun

## Sandbox reruns

- bun run fix initially failed only because dprint could not write its cache in the sandbox; the identical unrestricted rerun passed. - bun test initially had 11 WebSocket failures because Bun could not bind ephemeral port 0 in the sandbox; the identical unrestricted rerun passed. The final unrestricted run passed 1361 tests with 2 PostgreSQL-only skips. - E2E runs used unrestricted execution from the start because they require disposable PostgreSQL services and local application ports.