Phase 3.5 (hold_floor_kernel) + Phase 3.5.3 (cooldown_kernel) landed
the producer + state machinery; both deferred the action-selection
consumer wiring. This task wires both atomically.
Architectural decision: hold_floor is now an INLINE __device__
computation inside experience_action_select reading ISV slots
426/427/428/429 directly. The standalone hold_floor_kernel.cu +
launch_sp15_hold_floor + HOLD_FLOOR_CUBIN are deleted — launching a
kernel to write one f32 just to read it back was unnecessary. ISV
slots + state_reset_registry entries remain; only the launch path is
removed per feedback_wire_everything_up + feedback_no_legacy_aliases.
Entropy source: per-step Shannon entropy of softmax(e_dir) computed
inline from the 4 e_dir floats already in registers (Pass 1 of the
Thompson direction selector). High entropy = uncertain policy → Hold
gets the floor lift; low entropy = confident policy → floor ≈ 0.
q_eff_dir scratch preserves e_dir for downstream consumers
(out_conviction, out_q_gaps, out_magnitude_conviction) — adding
hold_floor there would corrupt the Kelly-cap warmup floor with a
meta-confidence mask.
cooldown mask: when ISV[COOLDOWN_BARS_REMAINING=435] > 0,
action_select hard short-circuits to dir_idx = DIR_HOLD before
Pass 2 — sidesteps the temperature-blend numerics where a
finite-sentinel-on-non-Hold approach would let pure-Thompson (τ=1)
samples dominate the masked direction. Cooldown supersedes
hold_floor — when forcing Hold the floor is moot.
3 new oracle tests:
- action_select_applies_hold_floor_inline (no cooldown)
- action_select_forces_hold_during_cooldown
- action_select_no_force_hold_when_cooldown_zero
Atomic per feedback_no_partial_refactor: action_select changes +
hold_floor_kernel deletion + cubin manifest update + 3 oracle tests +
audit doc all in this commit. No parallel paths, no feature flags.
Eliminates Phase 3.5 + Phase 3.5.3 deferred consumers. The
cooldown_kernel itself remains (it maintains the consecutive_losses
streak + decrements COOLDOWN_BARS_REMAINING per bar); only its
consumer is now wired.
Verified: cargo check -p ml --features cuda clean; ml lib suite
holds 946 pass / 13 fail = baseline; all 6 oracle tests pass on
RTX 3050 Ti (3 pre-existing cooldown + 3 new action_select).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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