jgrusewski 3f8e1fb553 refactor(per-horizon): rewrite smoothness controller test for N_HORIZONS=3 ...

Re-derive 3-element fixtures for [10, 100, 1000] preserving geometric
decay invariant. Rename excess_at_h6000_lifts_lambda_proportionally to
excess_at_h1000_lifts_lambda_proportionally.

Critical correction during execution: the kernel uses SQRT-anchored
TARGET_K_RATIO (since commit b5bed9f80 "sqrt K-ratio") not linear ratio.
The lifted-fixture computation mirrors the kernel's sqrt constant
(TARGET_K_RATIO_H2 = sqrt(10/1000) ≈ 0.3162) so the test fires the
lambda = 10 × base invariant under the actual kernel math.

Side-discovery (flagged for Task 5 scope expansion):
- cuda/smoothness_lambda_controller.cu:30 still has SLC_N_HORIZONS = 5
- TARGET_K_RATIO at lines 45-51 uses old-horizon formula {30/30, 30/100,
  30/300, 30/1000, 30/6000}. With N_HORIZONS=3 the kernel reads only
  slots [0..3] = {1.0, 0.5477, 0.3162} — those correspond to old
  30/30, 30/100, 30/300 ratios. h1000's smoothness target is currently
  anchored to OLD h300 ratio (functional bug requiring kernel update).

cargo test --test smoothness_lambda_controller_invariants: 4 passed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-22 01:07:33 +02:00

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