Drop Commons-Clause and monetization restrictions to enable incorporating third-party GPLv3 code in upcoming rig system work. Prior versions (0.1.0–0.5.x) remain under GPL-3.0 WITH Commons-Clause. From 0.6.0-ALPHA, GPL-3.0-or-later pure.
Remove build artifacts, dev tool configs, unused dependencies, and third-party source dumps. Add proper README, update .gitignore, clean up Makefile.