v4.0.0
* feat(memory): add branchable provider improvement system * fix(memory): harden provider recovery and cost controls * fix(memory): harden parallel resume and activation * fix(memory): close provider isolation and recovery gaps
* feat(memory): add branchable provider improvement system * fix(memory): harden provider recovery and cost controls * fix(memory): harden parallel resume and activation * fix(memory): close provider isolation and recovery gaps