Enforce code reuse.

Update libraries.

Update readme.

Merge pull request #6 from jorgegorka/v2.0

docs: update README and CHANGELOG for 2.0 release

chore: remove deprecated data files and update TemplateFiller

chore: remove 15 deprecated command files (27 → 12)

chore: remove 22 deprecated workflow files (32 → 10)

chore: remove 8 deprecated agent files (14 → 6)

feat: simplify 9 remaining commands for 2.0

feat: rewrite 7 remaining workflows as lean goal documents

feat: rewrite remaining agents as lean goal-oriented prompts

chore: vertical slice validation complete

style: fix rubocop offenses in verification_test.rb

feat: update Installer to install Skills to .claude/skills/