Solution description

• Automatic Version Checker: Queries PyPI once per 24 hours (cached) and displays a non-blocking warning when a newer version is available. Uses the packaging library for semantic version comparison.
• Update Command: Added trcli update command that wraps pip install --upgrade trcli with interactive confirmation, version comparison display, and comprehensive error handling. Supports --check-only and --force flags.

Changes

• trcli/version_checker.py - Version checking logic with PyPI API integration and caching
• trcli/commands/cmd_update.py - Update command implementation
• tests/test_version_checker.py - 34 unit tests for version checker
• tests/test_cmd_update.py - 13 unit tests for update command

Potential impacts

No breaking changes. Update notifications are non-intrusive and caching is in place.

Steps to test

• Test with different commands to ensure version check doesn't interfere. All should work normally with version check in background.
• run trcli update -> Should tell the current installed and latest version.

PR Tasks

• PR reference added to issue
• README updated
• Unit tests added/updated