Only settle the CFG-parallel dispatch key after a run that actually routed
the replica: a guidance-near-1 generation disables the overlap without
warming the replica, so its completed key must not unlock thread dispatch
for the next CFG-enabled run at the same shape (that first compile has to
stay serialized).
Restore the process-global thread-safe cuDNN attention patch when the
CFG-parallel install fails after the patch landed: no proxy is committed on
that path, so teardown would never reach it and later single-device
generations would keep running the direct aten replacement.
Tear down a CFG-parallel proxy installed by a load that is cancelled or
fails before the _VideoLoadState commit: the proxy owns a daemon worker,
the DiT replica's VRAM, and possibly the cuDNN patch. The load stashes the
proxy pre-commit and _run_load's error handler rolls it back, token-scoped
exactly like the speed-globals rollback.
Re-engage an EXPLICIT magcache choice when the actual step count differs
from the configured one, so the ratio curve, retention window, and skip
budget are re-interpolated over the real schedule (the on/off choice never
changes); auto already re-engaged via maybe_toggle_step_cache. The step
marker comparison uses endswith so #s5 cannot match inside #s50.
Bench fidelity: the e2e auto row quantizes companions before CUDA placement
(mirroring the loader, so load_peak_gb records the measured configuration),
the video bench clears step-cache residuals before every generation exactly
like VideoBackend.generate, and the image-interface dit/e2e modes reject
video families with a pointer to video_speedmem_bench.py.
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