fix(docs): correct 23 false claims found in documentation audit

fix(deps): use published mdstore module, remove local replace

feat(config): default new users to markdown backend with SQLite auto-detection

fix(tui): safe type assertion and cursor blink in setup wizard

feat(toki): remove sync command and add setup TUI wizard

feat: add markdown storage backend with config and migration support

fix: address roborev findings for install-skill

feat: add install-skill command and comprehensive test coverage

feat!: replace Charm KV with SQLite storage

chore(deps): update charm to v0.20.0

feat: add stale sync support using charm v0.19.0

feat: add sync repair/reset/wipe commands using charm v0.17.0

chore(deps): update charm to v0.15.3

test: skip charm-dependent tests in CI

chore(deps): update charm to v0.15.2 with backup lock fix