- 'all clients are idle' was accurate pre-patch; now this branch can run
while CONNECTED/ESTABLISHED clients exist. Clarify which states actually
block, and note that the inner coex revert has its own gate.
- Generalize the coex-revert rationale: 'lock's GATT Write Response' was
Yale-specific; the bug is generic to any peer GATT response that needs
to reach us while WiFi competes for the shared radio.