Polish live workbench shell layout

docs/CODEX_EXECUTION_LOG.md

@@ -2207,3 +2207,31 @@ Limitations:
 
 Next recommended pass:
 - Add export history filtering or retention controls if artifact history continues to grow during demo runs.
+
+## Sprint 55 live visual shell polish (2026-06-17)
+
+Changed:
+- Performed a Browser-based visual audit of the live Tower workbench at `http://192.168.10.150:1202`.
+- Confirmed the main visual defect was the cramped three-column desktop shell: left navigation, central workspace and inspector competed for width at 1280px.
+- Compacted the sticky top context bar and left navigation.
+- Changed the standard desktop breakpoint so the inspector moves below the workspace up to 1360px, while remaining a side panel on wider displays.
+- Made the Map toolbar wrap responsively instead of forcing four controls into a narrow row.
+- Added a workspace-change scroll reset so switching pages starts at the workspace heading instead of inheriting stale scroll position.
+- Added regression coverage for the standard desktop shell width and scroll-reset behavior.
+
+Tested:
+- Local Browser visual audit against `http://127.0.0.1:5177` using the live Tower API proxy.
+- Verified Overview, Data, Map and Exports workspaces visually after the shell changes.
+- Browser console error/warning check returned no entries.
+- `cd frontend && npm run typecheck`
+- `cd backend && python -m pytest tests/test_sprint53_selection_ergonomics.py tests/test_sprint50_workspace_usability_polish.py -q`
+- `cd frontend && npm run build`
+
+Open:
+- Run full readiness, deploy Tower and verify the live visual shell on `http://192.168.10.150:1202`.
+
+Limitations:
+- This pass remains UI shell polish only. It does not add features, change API contracts, alter migrations, fetch live providers or enable new AI models.
+
+Next recommended pass:
+- Continue with export history filtering or retention controls if repeated demo runs keep growing artifact history.