OpenPuzzle 1.0.50 — Vanity CUDA

OpenPuzzle 1.0.50 — Vanity Stop and Nodes

Two corrections to the existing Linux Vanity integration:

• Stop now cancels the assignment through the common API, like BitCrack, so the
  server can recycle the range. Safe Stop still completes the current assignment.
• The ordinary heartbeat reports Vanity / CUDA and its installation state. The
  existing private Nodes page displays it automatically; no API/schema change.

Cancellation is recorded before shutdown. Failed or lost replies preserve the
request for an idempotent cancellation retry, without a new claim, lease renewal
or engine launch. An interruption without a user Stop retains verified recovery.
Found solutions keep priority and private wallet export.

The 11 affected suites passed, including actual-client synthetic HTTP/engine
tests for single/multi-GPU Stop and Safe Stop, cancellation retries and heartbeat.
Previous real RTX 4070 SUPER known-address validation is preserved; no real GPU
run or new benchmark was performed to prepare this correction. Real multi-GPU
rig acceptance and production website solution notices remain unverified.

GPU engines, tuning, profiles, range sizing and server scheduling are unchanged.
Finish active work with Safe Stop and close the application before installing:

sudo apt install ./OpenPuzzle-1.0.50-Linux-x86_64.deb

Verify the attached SHA256SUMS first. The portable updater DEB is byte-identical
to the normal DEB; TGZ and exact source archives are included. Private profiles,
checkpoints and keys are not release assets. Windows remains a separate test.

Source commit: 2432e02ad0af7b5569feb52669018035efa7a2c8.