Local launch and managed startup now start the incoming-key owner for sessions installed with keyboard-inject, using one input-helper Supervisor retained for the reader lifetime. Delivery rechecks lock, XTerm handoff and internal reader UI in addition to lease, grant and deadline. build-cthulhu.sh and both Arch packages build and install cthulhu-input-helper; a missing helper leaves keyboard input unavailable without affecting startup. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>