Why: T5 acceptance evidence - the D31 conversation-completeness walkthrough on a fresh instance plus tidy/badge and guide updates. Evidence: walkthrough 12/12 PASS (fresh binary, empty data dir, conversation-only driving end to end); ui StatusLamp dual-encoding assertions; frontend 9/9 + build. Impact: docs/records only. Refs: docs/proposals/2026-09-30-ui-inbox-command-workspace.md T5; task card feature/polish-r1