Proof: npm test; node --check src/apps/inventory-sync.mjs; node --test test/inventory-sync-static.test.mjs test/trading-config.test.mjs.
Assumptions: Inventory refresh failures should be logged with the active pair when available, but error logging must not throw if trading config loading or refresh work fails.
Still fake: No BTC/USDC external reference price route or liquidity model exists; non-nBTC/EURe pairs still fail closed on missing price route until that path is built.
