yaleman / timeout-cli / #1

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Implement kill-after functionality with comprehensive debugging and testing

- Add --kill-after option for SIGTERM -> SIGKILL escalation
- Implement proper signal handling with libc integration
- Add advanced exit codes (124, 125, 126, 127, 137) matching GNU timeout
- Include verbose debugging mode (-v, --verbose) for troubleshooting
- Add comprehensive process state tracking and timing management
- Create robust test suite with 25 passing tests covering:
  * Responsive processes (SIGTERM works)
  * Unresponsive processes (requires SIGKILL)
  * Normal completion scenarios
  * Edge cases and error conditions
  * Verbose mode and help text verification
- Update README with new options, exit codes, and examples
- Ensure full GNU timeout compatibility for kill-after behavior

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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