Merge original CLI check implementations from hm_qc/ and
hm_qc_video/ repos into modules/*/checks/legacy/ directories.
Includes profiles, launchers, utils, orchestrators, and the
standalone video Flask web app. Reference files (test data,
results, cheat sheets) copied to gitignored reference/ directory.
Censorship trainset copied to gitignored data/supporting/.
The legacy/ naming convention separates original run_check()
function-based implementations from the new BaseCheck class
architecture.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>