v2.2.1

Highlights:

Refactored the validator into a modular Python package to improve maintainability, testability, and CLI usability.
Introduced a proper CLI entry point via csb_validator.cli with support for both crowbar and trusted-node validation modes.
All core logic split into discrete modules:
runner.py handles async orchestration
validator_crowbar.py and validator_trusted.py encapsulate validation logic
pdf_writer.py generates summary reports
line_mapper.py enables precise line-level error mapping
added main.py for support of python -m csb_validator

Fixes:

resolved import path and Any type hint errors
removed sys.path hacks and redundant imports in tests