v4.0.0

• Load testing — Added --warmup to run untimed requests before the benchmark window
• Load testing — Added --proxy for HTTP and HTTPS targets through an HTTP(S) proxy (including CONNECT tunneling)
• Load testing — Added --urls-file for round-robin multi-URL targets; positional URL is optional when the file is provided
• Load testing — Added repeatable --cookie flags and --random-path for cache-busting path segments
• CI/CD — Added --fail-on-error, --fail-on-transport-error, --max-fail-rate, and --max-p99 for pipeline-friendly exit codes
• CI/CD — JSON output uses a structured schema (summary, latency_ms, status); legacy duplicate keys removed
• Performance — Rate limiter now uses lock-free slot reservation instead of a global mutex
• Performance — Redirect hops drain response bodies and close cross-origin clients to improve connection reuse
• Performance — Duration mode freezes throughput timing at the deadline and drains late worker batches during a short grace window
• Resilience — Transport errors from any request exception are counted without aborting workers
• CLI — Live stderr progress is enabled by default (--no-progress to disable)
• CLI — Added -V / --version to print the installed release
• Refactor — Split monolithic source into focused modules under src/cryload/
• Refactor — Split CLI validation and option resolution into Cli::Validator and Cli::OptionsBuilder
• Documentation — README now documents exit codes, JSON fields, CI threshold examples, and a GitHub Actions workflow snippet
• Documentation — Added docs/json-output.md JSON field reference
• Releases — GitHub Releases now include notes extracted from CHANGELOG.md
• Tests — Added unit specs for Request redirects, Logger JSON/CSV output, HTTPS --insecure, and CLI validation for proxy/cookie/warmup
• Tests — Spec helper rebuilds the binary when source files change
• Architecture — Single shutdown path via ShutdownCoordinator (one log_final + exit)
• Tests — Added live --progress stderr e2e and HTTP --proxy integration test
• Releases — Added Linux arm64 binary, post-build smoke tests, and install script arm64 detection