Wrapper process that integrates reliability features for MCP clients.

This process intercepts calls to the underlying client and applies:

• Circuit breaker protection
• Retry logic with exponential backoff
• Health monitoring integration
• A bound on concurrently in-flight requests

Options

• :client - the wrapped ExMCP.Client pid (required)
• :circuit_breaker - circuit breaker pid, or nil to disable
• :retry_opts - retry policy passed to ExMCP.Reliability.Retry
• :max_concurrency - maximum requests executing at once (default: 100). Calls beyond the limit are rejected with {:error, :too_many_requests} instead of spawning unbounded work against a struggling server.