Concurrency limits for Tuist Runners

Tuist Runners now enforce account-level CPU and memory concurrency limits independently for macOS and Linux. Jobs that would exceed the available capacity remain queued until resources become available, preventing a single workload from monopolizing the shared runner fleet.

The Runners dashboard shows hourly peak CPU and memory usage, with red bars for hours when a limit was reached. Limits can be tuned per account as runner needs grow.