The bluez-dbus connect watcher (used to surface BT disconnect / reconnect
events to the UI without restarting Solaar) was only installed in the
non-Centurion device path of _start(). The Centurion-direct fallback —
used for wired headsets and, prospectively, for BT-paired Centurion
headsets where there's no LIGHTSPEED dongle — skipped it.
Factor the post-create_device wiring (configuration.attach_to + bluez
watch installation) into a shared _post_attach_device() helper that
both paths call. No behaviour change for wired headsets (they aren't
Bluetooth, so the watch installation is a no-op for them). For
BT-paired headsets that come through the centurion-direct fallback,
this makes reconnect events propagate the same way as for any other
BT-paired Logitech HID++ device.
Also broadens the docstring on create_centurion_receiver to mention
BT-paired Centurion headsets as a valid "direct device" case alongside
wired headsets.
First commit on the centurion-bluetooth branch — see
~/.claude/plans/can-we-make-a-graceful-dongarra.md for the full plan.
Hardware verification still required to confirm Path A (existing
hidraw pipeline works for BT Centurion) before any further changes.
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