Refactor workbench into task-based UI shell

docs/CODEX_EXECUTION_LOG.md

@@ -2042,3 +2042,28 @@ Limitations:
 
 Next recommended pass:
 - Run release readiness, deploy Tower and decide whether to manually acknowledge the current collation version.
+
+## Sprint 49 Workbench shell UI refactor (2026-06-17)
+
+Changed:
+- Audited the live workbench UI and confirmed the main usability issue was information architecture: all V1 workflows were mounted as one long vertical panel stack.
+- Refactored the frontend into a task-based workbench shell with Overview, Data, Map, QA/QC, AI Labs, Exports and System workspaces.
+- Added a persistent top context bar for active project, AOI, dataset and layer state.
+- Moved selected dataset details into a persistent right-side inspector while keeping the same dataset/raster/vector operation callbacks.
+- Added stable primary navigation test anchors.
+- Documented the new frontend shell structure and updated the changelog.
+
+Tested:
+- `cd frontend && npm run typecheck`
+- `cd frontend && npm run build`
+- Local Vite visual audit on `http://127.0.0.1:5175`
+
+Open:
+- Local Vite visual audit shows `Request failed (404)` when no local backend/proxy target is available. Docker/nginx same-origin proxy behavior remains the production path.
+- The next pass should run full release readiness and deploy to Tower for browser-facing verification on `http://192.168.10.150:1202`.
+
+Limitations:
+- This pass intentionally changes UI structure only. It does not add product capabilities, alter API contracts, change migrations, fetch live providers or enable new AI models.
+
+Next recommended pass:
+- Run full readiness, rebuild/deploy Tower, then perform a live browser smoke through the new workbench navigation.