`solaar show` (and any exit path) printed a cascade of "I/O operation
on closed file" / "sys.meta_path is None" logging errors at the bottom.
Two compounding causes:
- Device.close() was not idempotent. The CLI closes devices explicitly,
then __del__ calls close() again during interpreter shutdown, re-running
every device cleanup a second time. Guard with a _closed flag (not
self.handle, which is legitimately None for receiver-paired devices).
- rgb_power.cleanup() read device.settings — the lazy property — which
forces a first-time settings build. Running that build during shutdown
fails because gettext can no longer import (sys.meta_path is None),
raising inside a __del__ handler. Read the already-built settings (or
the persister) via a new _rgb_control_off() helper that never triggers
the build.
Either guard alone stops the crash; both are correct hardening for a
__del__-invoked path.
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