fix(cli): enforce selectors in multi-env sessions

chore(release): v0.3.21

docs(skill): add reliable markdown list formatting guidance

chore(release): prepare v0.3.20

chore(onboarding): add explicit workspace-init messaging and flag glossary

fix(workspace): no-overwrite init and production-safe guide updates

fix(onboarding): align workspace init, install flows, and writing guide

feat(workspace): add init command and production onboarding guide

feat(books): add local bundle validation command

docs: align skill path and upload commands

feat(skills): default install root to user home

chore(release): prepare v0.3.18

Fix books update idempotency reuse across tag writes

Add books archive and unarchive commands

chore(release): prepare v0.3.16