Per `feedback_isv_for_adaptive_bounds`, the hardcoded
`warmup_gate = (fold_step_counter / WARMUP_STEPS_FALLBACK).min(1.0)`
ramp violated the rule: adaptive bounds in ISV, never hardcoded
constants. The variance-driven k_aux/k_q sigmoid steepness already
provides warmup behavior intrinsically:
- High variance (cold-start, EMAs still moving) → k → K_MIN → flat
sigmoid → gate ≈ 0.5 regardless of input. That IS the warmup.
- Low variance (settled) → k → K_BASE → sharp sigmoid → gates
respond correctly to driver signals.
Adding a separate hardcoded step-counter multiplier on top was
double-counting + tuning-driven (the 1000-step threshold had no
principled basis). Removed entirely.
Removed (per `feedback_no_partial_refactor`, all atomically):
- `WARMUP_STEPS_FALLBACK` constant in `sp14_isv_slots.rs`
- `warmup_gate: f32` parameter in `alpha_grad_compute_kernel.cu`
- `gate1 * gate2 * warmup_gate` → `gate1 * gate2` in kernel
- `warmup_gate` arg from `launch_sp14_alpha_grad_compute`
- `fold_step_counter: usize` field on the trainer struct
- `fold_step_counter = 0` reset in `reset_for_fold`
- `fold_step_counter` init in trainer constructor
- `let warmup_gate: f32 = 1.0;` and `.arg(&warmup_gate)` from B.4
oracle tests (4 launches: 2 in alpha_grad_schmitt_hysteresis,
20 in alpha_grad_adaptive_beta loop)
Build: clean, 18 warnings (pre-existing baseline).
Tests: cargo test --no-run on sp14_oracle_tests succeeds.
Net result: EGF gate's warmup behavior now lives entirely in the
variance-driven k_aux/k_q sigmoid steepness controller (ISV slots
388/var_aux, 389/var_q). No hardcoded step counter. Honors
`feedback_isv_for_adaptive_bounds` and `pearl_controller_anchors_isv_driven`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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