Release waits (bounded) while any process still holds the checkout lock's
byte (hermes_cli/update_lock.py takes it with msvcrt.locking at 1 MiB), and
-MarkerOp reclaim answers `held` instead of freeing a dead marker in that
state, so a Desktop gate never opens over a surviving completion. posix.sh
withdraw now keeps a dead adopter's claim (`foreign`), like marker.ps1.
(cherry picked from commit 8a5525d26f036a3c4b5176f11ee4a590c746e2db)
b802f677b5