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index 4b886b3..93245c4 100644
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+++ b/docs/04-implementation/02-practical-challenges-and-adversarial-interop.md
@@ -56,8 +56,11 @@ without a methodology is not accepted in this project.
physical GPU (see §3). CE-class copies and their semaphore releases are now
forwarded to the physical copy engine (default off) with a host-side fault
relay, and memsets/copies/releases the host decoder understands still run in
- software as a fail-closed correctness bridge. No CUDA kernel is forwarded
- yet: GR kernel execution is blocked on GR engine-context validity.
+ software as a fail-closed correctness bridge. GR (kernel) execution is the
+ open frontier: a forwarded guest launch reaches the front-end but the inline
+ launch-descriptor install has not been observed and no grid has dispatched
+ (context validity at dispatch is ruled out — see
+ [`03-execution-frontier.md`](03-execution-frontier.md)).
## 3. Forwarding: the options and the chosen mechanism