Uses loadFullConfig (already imported from ConfigBootstrap) for config loading,
eliminating the need for a dynamic ConfigLoader import. ConfigValidator is still
lazily imported to minimise the blast radius.
Returns Promise<string>
Formatted validation report string for display in Telegram.
Runs all validation checks on the live config.
Uses loadFullConfig (already imported from ConfigBootstrap) for config loading, eliminating the need for a dynamic ConfigLoader import. ConfigValidator is still lazily imported to minimise the blast radius.