v0.1.20

Changelog

• ec003c7 Merge branch 'issue-391629e-move-writefileifchanged'
• d7610a6 Merge branch 'issue-90f3dd2-installer-stale-file-cleanup'
• 110c51c chore: add .claude/worktrees/ to gitignore
• da02ccf docs: align docs and migration guidance with shared install model
• e2d5e92 feat: add CLI commands for policy CRUD and project add/remove
• 9c150f7 feat: install shared skills once and project into Claude and Codex
• ab93f44 feat: install shared skills once and project into Claude and Codex
• 5f341fe feat: refactor installer around neutral ArtifactSet and ToolAdapter interface
• d6e3237 feat: separate execution policies from prompt instructions
• 20c043b fix: auto-run install after agm add to write new files
• 6760d2e fix: auto-run install after agm remove to clean stale files
• a0ee7f5 fix: clean up stale installed files when items are removed from config
• 9c48d92 fix: use yaml.Marshal for skill frontmatter in installCanonicalSkills
• 85c89a3 refactor: move writeFileIfChanged from claude.go to shared.go