Feat/safety circuit breaker#18
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A single stale feed previously reverted the whole rebalance, because getWeights priced every constituent. The rebalancer now weights and trades over the FRESH subset, so the healthy names rebalance while a quarantined name is held marked-down (Section 4) until its feed recovers. - openEpoch and maxDriftBps build a fresh subset (constituents whose feeds are not quarantined) and call getWeights over it, so a stale feed no longer reverts the trigger or the snapshot. maxDriftBps keeps a fresh-index cursor aligned to the full holdings array. - A quarantined name is excluded from the epoch entirely: not targeted, and validateOrder's inEpoch check rejects any order for it. This is the Section 16.5 stale-feed special case: the name cannot be priced, so it cannot be sold either (sellMinOut anchors to the failed oracle), so it is held rather than wound down until the feed recovers. Completes the Section 4 safety layer (quarantine, circuit breaker, rebalance around quarantine). 3 new tests, 162 total green.
feat(rebalancer): rebalance around a quarantined constituent (Section 4)
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