No user visibility into state — the app needs a State-Inspector surface

State lives in five places (per-remote Svelte runes singletons, localStorage keys, the WS-synced workspace frames, server-side stores, the canonical DB) and none of them are inspectable from inside the app. Non-technical users won't care — but the operator debugging a desync, and the agent verifying a flow, both need one surface that shows who currently believes what.