feat(guard): NAV circuit breaker with auto-pause#8
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Adds a NAV circuit breaker that bounds how far the share price can move between checkpoints.
SharePriceDeviation) if the live share price deviates beyondmaxSharePriceDeltaBps, so users never transact at an anomalous NAV. Self-healing.guardCheckpoint(): a keeper/agent poke that commitspaused = trueon a breach (a revert can't latch a pause in the same call), persisting until the owner reviews.setMaxSharePriceDelta,pause/unpause(rebaselines). Default bound0= disabled.LibGuard(single source of the virtual-share offset).104/104 unit tests pass (15 new); no storage collisions.