feat: add auto_update config, clarify auto_install vs auto_update vs auto_check
- auto_install (default: true) — install missing binaries on register - auto_check (default: true) — check for available updates periodically - auto_update (default: false) — auto-update when newer versions found - Disabling auto_check also disables auto_update - Updated README and help docs
4 files changed+34−9
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