NAV (net asset value) time-series for a bound wallet

NAV (liquidation equity, USD) over the requested `window`. Hyperliquid uses its paired grid or persisted snapshots. Polymarket returns complete account-value observations (`positions value + USDC.e cash`) captured from the cutover onward as `pm_nav_observations`; their `netDepositsUsdc` is always null because NAV-only observations are not performance checkpoints and must never be used for PnL or ROI. `history.status=partial` explicitly represents a missing historical prefix.