The seam problem
Every cycle boundary is a seam, and seams are where risk leaks.
The 4-trade concurrent cycle gives deployment a clean rhythm: authorize a pool, deploy into it, close the cycle, decide again. The rhythm has one structural weakness — trades are not obligated to finish when the cycle does. A trend trade opened on Tuesday may still be running when the next cycle's authorization is priced on Thursday. Without explicit accounting, that surviving position is invisible to the new cycle's arithmetic: the fresh pool gets sized as if the account were flat, and the account ends up carrying the old risk plus the new pool. Do that across a few boundaries in a trending week and actual exposure can quietly grow far beyond anything any single cycle ever authorized. Carryover accounting closes the seam by making open risk a first-class input to every fresh authorization.

