Run liquidation drill

Vigil queues a liquidation job. The first available keeper executes a partial close (10% of position). Margin recovers. Position survives.

Contract: Vigil.execute_liquidation

Pending on testnet

Vigil is deployed, but a liquidation needs an under-collateralised position, which depends on step 2 (open a position) being runnable first.

The four live steps (deposit, chaos drill, proof of reserves, kill switch) run end to end today.