The SP7 controller wrote real budgets to ISV[BUDGET_CQL_BASE/C51_BASE] and
the activation flag correctly transitioned 0→1, but downstream SAXPY ops
still saw exactly 0.02/0.05 every step. Root cause: compute_adaptive_budgets
ran host-side Rust with `if cql_active >= 0.5 { real } else { bootstrap }`,
captured into the aux_child CUDA Graph at step 0 of each fold (when
cql_active is FoldReset sentinel 0.0). The bootstrap branch resolves to
literal 0.02/0.05 and freezes into kernel arg buffers; ~1000 graph replays
per fold use frozen scalars regardless of runtime ISV state.
Same disease as SP4 host-side EMA elimination 2026-05-01. Fix:
- New consume_lb_budget_kernel.cu (8 threads, 1 block): reads ISV slots
for activation flag + controller budget per (head, branch); applies
if/else dispatch on-device; writes trunk_mean + per-branch correction
to mapped-pinned scratch buf [10] = (cql_trunk + cql_corr×4 + c51_trunk
+ c51_corr×4). Same cubin houses dqn_{scale,saxpy}_f32_dev_ptr_kernel
variants reading alpha from a device pointer (no kernel-arg freeze).
- Buffer + launcher + cubin loading + 4 dev-ptr accessor methods
in gpu_dqn_trainer.rs.
- apply_c51_budget_scale / apply_cql_saxpy + per-branch variants take
alpha_dev_ptr: u64 instead of scalar f32. The "skip when ≈ 1.0"
optimization is dropped — the value lives on-device. Existing scalar
dqn_{saxpy,scale}_f32_kernel are NOT modified — they remain reused
by distill, VSN dW dilution, etc.
- compute_adaptive_budgets refactored to launch the dispatch kernel
inline (captured along with consumers; replay-time fresh values
every step) and stop returning host-resolved CQL/C51 scalars.
IQN/ENS keep their host-side resolution (out-of-scope per change
scope — no activation-flag dispatch).
- HEALTH_DIAG reads from lb_budget_effective_buf via new accessor
methods on FusedTrainingCtx; dead caches on GpuDqnTrainer
(last_{cql,c51}_budget_eff / _per_branch) deleted.
- Audit doc Fix 33. Memory pearl out-of-tree.
Bootstrap byte-equivalence preserved: kernel-arg constants
cql_bootstrap=0.02 / c51_bootstrap=0.05 remain byte-identical to the
prior host-side CQL_BOOTSTRAP_BUDGET / C51_BOOTSTRAP_BUDGET literals
and to loss_balance_controller_kernel.cu's COLD_START_FLOOR_* anchors.
Files: consume_lb_budget_kernel.cu (new), build.rs, gpu_dqn_trainer.rs,
fused_training.rs, training_loop.rs, dqn-wire-up-audit.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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