A development team of 8 engineers is implementing a Claude integration for a SaaS application. Team members are experiencing frequent conflicts: one engineer's prompt changes break another's features, cache configuration changes cause unexpected cost spikes across the team, and API rate limits are exhausted by one engineer's load testing affecting others. The team shares a single production API key, a single development API key, and a shared staging environment. Development velocity has slowed significantly due to these conflicts. The engineering manager needs architectural changes to enable parallel development without interference. Which operational architecture should the architect implement to restore development efficiency?