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AI-assisted development tools enable software engineers to generate implementations at substantially higher speed and volume than in traditional workflows. Software teams have long relied on guardrails - standing control mechanisms such as code review, linting, testing, and CI/CD pipelines - to maintain quality and coordination. High-throughput AI-assisted generation increases pressure on these guardrails - straining their capacity to keep pace with the volume and rate of generated changes - and reshapes how organizations supervise development workflows, yet relatively little is known about how existing guardrails evolve in response. We conducted a qualitative interview study with five software engineering practitioners, situated within a broader practitioner survey. Our findings indicate that organizations distribute the work of supervision across multiple guardrail layers: preventive guardrails (produced by externalizing architectural intent and conventions into machine-interpretable form), executable guardrails (linting, testing, and CI/CD repurposed as scalable supervision infrastructure), and human oversight (shifting from line-by-line inspection toward supervisory interpretation focused on architectural reasoning, explainability, and long-term maintainability). We characterize this as a transition from review-centric guardrails toward layered supervision, in which no single guardrail carries the supervision load alone.