Fix: a blue/green deployment never came back down to the right instance count if the…

v0.20.2-beta

Fix: a blue/green deployment never came back down to the right instance count if the count had already drifted (e.g. following the ghost-instance bug fixed in 0.20.1-beta). The scale-up target calculation (+1 relative to the OBSERVED replica count) completely ignored the plan/project's CONFIGURED instance count — each redeployment merely added one more replica to the already-wrong count, never converging on the right value. The hub now passes the configured instance count with every blue/green deploy-app, and the agent explicitly reconciles to that exact count after the swap (instead of trusting the observed count, potentially already drifted).