Fixes the SP7 controller dormancy discovered in smoke-test-8556k:
per-branch budgets stuck at exactly bootstrap constants because the
kernel's cold_start_basis numerically equaled the consumer's bootstrap
fallback, AND the Wiener-α was clamped at ALPHA_FLOOR=1e-4 from step 1.
Architectural change:
- 8 new ISV slots LB_{CQL,C51}_ACTIVE_BASE per (head × branch).
Activation flag is monotonic per fold, FoldReset on boundary.
- Kernel only sets active=1 when grads are populated AND on subsequent
active-state computation; cold-start branch leaves active=0 (fresh
branch) or holds prior budget steady (transient grad gate).
- Consumer dispatches on activation: bootstrap when active<0.5,
controller verbatim when active>=0.5. No more spurious bootstrap
when controller writes legitimate small values.
- Welford-α hybrid (max of 1/max(1,epoch_idx_in_fold) and Wiener-α)
gives full update on first active step, falls off as 1/N until
Wiener takes over with meaningful variance estimates. EPOCH_IDX_INDEX
is the existing per-fold-reset counter (no new tuned constants).
State reset registry: 2 new sp7_lb_*_active FoldReset entries +
matching dispatch arms in reset_named_state. Contract test
(every_fold_and_soft_reset_entry_has_dispatch_arm) gates compile.
GPU unit test sp7_loss_balance_controller_activation_flag_transitions
exercises 3 transitions (cold start → both flags 0; active → both
flags 1 with controller-computed budget != bootstrap; transient grad-
gate → flags hold at 1, prior budget held verbatim). Passes on local
RTX 3050 Ti.
Audit doc: Fix 31 sub-bullet describing the activation-flag fix.
Memory pearl out-of-tree (controller will dispatch separately).
Touched:
crates/ml/src/cuda_pipeline/sp5_isv_slots.rs
crates/ml/src/cuda_pipeline/loss_balance_controller_kernel.cu
crates/ml/src/cuda_pipeline/gpu_dqn_trainer.rs
crates/ml/src/trainers/dqn/fused_training.rs
crates/ml/src/trainers/dqn/state_reset_registry.rs
crates/ml/src/trainers/dqn/trainer/training_loop.rs
crates/ml/tests/sp5_producer_unit_tests.rs
docs/dqn-wire-up-audit.md
Cargo check workspace clean. Cargo test ml --lib clean (incl. contract
test + 6 sp5_isv_slots tests). 16 pre-existing failures unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
cb6a89714b