Brainstorm spec for SP10. Resolves the val-Flat-collapse pathology that
persisted through Fix 33-37: the eval-time argmax in experience_action_
select picks Hold deterministically every val bar (dir_entropy=0,
trade_count=1 in 214k bars) regardless of controller state.
Architecture:
- Delete `if (eval_mode)` argmax branch in direction-selector kernel
- Use temperature-blended Thompson: q_eff = E[Q] + τ × (Thompson - E[Q])
- τ = clamp(intent_eval_divergence / divergence_target, 0.5, 2.0)
- τ self-corrects: collapse → high τ; healthy → low τ; permanent 0.5 floor
- Reuses SP9's intent_eval_divergence_compute_kernel (extended, not new)
Per pearl_controller_anchors_isv_driven: τ is ISV-driven, no
hardcoded constants beyond Invariant 1 numerical anchors (clamp range).
Per pearl_blend_formulas_must_have_permanent_floor: MIN_TEMP=0.5 ensures
eval ALWAYS has stochasticity.
The pearl_thompson_for_distributional_action_selection was about Bellman
TARGET argmax (selector/target symmetry). It does NOT prohibit Thompson
at the rollout selector. SP10 amends the pearl to clarify.
Scope: 1 ISV slot, kernel modification (no new kernel — extend SP9's
producer), 1 consumer kernel rewrite, test update, pearl amendment,
audit doc Fix 38. ~300-500 LOC, single atomic commit per
feedback_no_partial_refactor.
6ae9bc0055