README CLI: comment-first bash examples, convert/merge/get order, real-world flows. Move architecture decisions pointers into CONTRIBUTING; trim AGENTS and README. Co-authored-by: Cursor <cursoragent@cursor.com>
Add CONTRIBUTING.md for testing, PR checks, and release-please flow; link from README and AGENTS. Document envc bash sourcing (set -a, source <(...)) for YAML/INI. Co-authored-by: Cursor <cursoragent@cursor.com>