Two collector-side device buffers used by the K=3 trade-outcome head
were missing FoldReset registry coverage:
- prev_aux_outcome_probs [alloc_episodes × 3]
TRUE stale-read risk. Producer writes end-of-step; consumer
(experience_state_gather) reads start-of-next-step into
state[121..124). Without FoldReset the new fold's step-0 state
gather would inject the previous fold's last-step softmax probs
into the first batch's state slots.
- exp_aux_to_input_buf [alloc_episodes × 262]
Cleanliness-only. Concat kernel overwrites all 262 columns every
step before the K=3 forward reads them, so no steady-state stale-
read risk. Registered for parity with the rest of the K=3
pipeline + to satisfy feedback_registry_entries_need_dispatch_
arms (the pin test asserts every registry entry has a matching
dispatch arm in reset_named_state).
Both fields promoted to pub(crate) on GpuExperienceCollector so
reset_named_state can reach them. Matching dispatch arms added with
the standard memset_zeros pattern (is_win_per_env / hold_baseline_
buffer style).
Tests: All 10 state_reset_registry tests pass, including the critical
every_fold_and_soft_reset_entry_has_dispatch_arm pin test that walks
the dispatch body and validates parity with registry entries. Full
lib suite 1015/1 (the failing test is the pre-existing
test_dqn_checkpoint_round_trip NoisyLinear flake — pred1/pred2 sign
mismatch surfacing ~30-50% of full-suite runs, documented in
project_sp22_h6_vnext_resume memory as unrelated to this work).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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