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Fixes #23. Registered hooks run through Bash, so installed packages keep working when execute permissions are stripped. All three source scripts also retain executable mode, checked by CI. Includes the fix from contributor PR #24.
Linux and macOS CI run the registered commands from an installation path containing spaces with every script set to mode 644. Startup policy, persisted tier, prompt nudging, the counter notice and its reset all pass. Existing smoke and model-tier checks also pass.