[serge-rider]

Closes dbeaver/pro#11169

Companion to dbeaver/dbeaver#42482.

Summary

• Check root help remains complete and all help aliases agree.
• Compare root-only version parsing with full Picocli parsing.
• Check selected-command help matches option-first parsing and unknown commands retain error locations.
• Verify completion includes contributed commands when invoked as the first command.

Verification

• CE CLI suite: 45 tests passed.
• Pro CLI suite: 14 tests passed.
• Packaged dbvr-pro Bash and Zsh completion include driver, sql, and secret-manager.

AI-assisted implementation (OpenCode).