Reliable flows and load tests in CI

This release makes atra's(Atrahasis CLI) flow runner and load tester behave predictably behind CDNs and inside CI.

• Compressed responses are decoded everywhere. Responses returned with gzip, deflate, or brotli encoding (common behind CDNs and proxies such as Cloudflare) are now decoded in flows and load tests, so scripts and assertions always receive the full response body.
• Clear output without an interactive terminal. Flows and load tests now print a readable plain text summary when there is no interactive terminal, such as CI pipelines or redirected logs. The summary includes each step result and the correct exit code, so assertions keep gating your pipeline.
• No terminal required. Running flows and load tests no longer needs an interactive terminal.