D6: Partial-unwind liquidation protection#230
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- Add orange_hf (trigger) and target_hf (restore-to) fields to Config - Replace compute_unwind_loops with compute_partial_unwind: closed-form minimal repay/withdraw to restore HF to target_hf in one atomic step - Add submit_partial_unwind to blend_pool: single [Withdraw, Repay] submit - rebalance() now triggers on HF < orange_hf and executes partial unwind - Tests: already_at_target, no_debt, single_loop (minimality), max_loops, unhealthy_position
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Summary
Implements orange-zone partial unwind: when HF drops below a configurable
orange_hfthreshold, unwind the minimal amount needed to restoretarget_hfrather than forcing a full close.Changes
storage.rs— Two newConfigfields:orange_hf— trigger threshold (partial unwind fires when HF drops below this)target_hf— HF to restore to after unwindleverage.rs— Replacedcompute_unwind_loopswithcompute_partial_unwind:Closed-form solution for the minimal repay amount
x:Returns
(0, 0)if already at target or no debt.blend_pool.rs— Newsubmit_partial_unwind(repay, withdraw, config): single atomic[WithdrawCollateral, Repay]submit with exact amounts.lib.rs— Constructor acceptsorange_hf(arg 8) andtarget_hf(arg 9).rebalance()triggers onhf < orange_hf, permissionless (keeper- or user-callable).Tests
test_partial_unwind_already_at_target— returns (0, 0)test_partial_unwind_no_debt— returns (0, 0)test_partial_unwind_single_loop— correct amount, minimality verifiedtest_partial_unwind_max_loops— partial (not full) close restores HFtest_partial_unwind_unhealthy_position— HF restored to targetCloses #47