Phase E.4.A Task 6: tiny CUDA kernel that pushes a state[state_dim]
vector into slot `head_idx` of a circular window buffer
[K, state_dim]. Host tracks head_idx and zeros buffer on episode
reset. This is the GPU-side append primitive that the smoke
binary's per-step inference will call (T7) before Mamba2 over the
buffer (T8).
GPU smoke (alpha_window_push_circular_writes_to_indexed_slot):
writes state_a at slot 0, state_b at slot 2, verifies non-targeted
slots stay zero. PASS.
docs/isv-slots.md: documents kernel as slot-agnostic per
kernel-audit-doc hook requirement.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
6e86e5b435