v1.0.0 - Session Timer

What’s new

• Added session_timer.py as a dependency-free session timer.
• Added configurable refresh interval with --interval.
• Added session logging with --log.
• Added automatic stop after a configured duration with --hours.
• Added quiet mode with --quiet.
• Added --version and improved command-line help.
• Added graceful handling for Ctrl+C and SIGTERM.
• Updated the README with usage examples, security guidance, and troubleshooting.
• Clarified that the timer does not keep remote servers alive or bypass provider limits.

Validation

• Python syntax compilation passed.
• CLI help and version checks passed.
• Logging and automatic-stop behavior tested.
• Invalid interval validation tested.
• git diff --check passed.