reynold ca98742891 Fix macOS compatibility: Add portable timeout helper ...

- Add utils.sh with cross-platform timeout functions for macOS compatibility
- Fix sf-logs-tail to use portable_timeout instead of GNU timeout command
- Fix test-all-wrappers.sh to use portable_timeout_seconds for testing
- Update README.md with macOS compatibility documentation

The timeout command is not available by default on macOS, causing
sf-logs-tail and test scripts to fail. The new utils.sh provides
fallback timeout functionality that works on Linux, macOS with/without
GNU coreutils, maintaining exit code 124 compatibility.

2025-08-28 21:08:58 +08:00

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