exp: 轮次33——限幅实测要付5.1pp到达（57.4→52.3%）；GPU真实周期36.7ms≈27Hz，瓶颈是重复几何而非推理

- 四组单变量对照（同256题同seed）：base / inc_cap / gap_margin 0.5 / 两者同开
  限幅后 到达 0.5742→0.5234、time_ok 0.3906→0.2656、2s误差比 0.210→0.279、超VMAX 1.0→0.0、刹停几乎不变
  → 之前那部分到达率是超速换来的；损失在逼近末段，不在刹停
- 0.5mm 余量门只付 3 题（0.5742→0.5625）；但 plans['gaps'] 在 0.5mm 截顶，5mm 护栏可达性需抬 cap 重算
- 前提更正：eval_cl 不传 steps、rollout 默认 steps=1（policy.py:156 一步生成），先前按 steps=16 得到的
  "当前配方 116ms≈8.6Hz" 作废；真实配方 36.68ms P50 / 49.17ms P99 ≈ 27.3Hz
- 归因更正：空算子 0.028ms、空 sync 0.005ms、encode 2.27ms → 不是启动/同步地板；
  单步推理仅 7.2ms 且 K=1→8 免费，周期里 ~27ms 是 cum_xf+宽相位的重复计算
- certify_uniform 挂上后 36.7→45.3ms（n=8）/49.6ms（n=16）
- kin_torch 补 a/b 形状守卫（脚本里广播不一致会算错 view），测试 30→31 项

docs/experiment_round33_both.json

@@ -0,0 +1,70 @@
+{
+  "config": {
+    "ckpt": "ml/runs/base_dag2_dag1/best.pt",
+    "samples": "ml/data/samples",
+    "tasks": null,
+    "split": "val",
+    "n": 256,
+    "K": 8,
+    "commit": 2,
+    "fb": 2.2,
+    "ki": 0.0,
+    "fb_scale": 0.0,
+    "fb_near": 0.2,
+    "fb_fallback": 0.0,
+    "kdecay": 0.9,
+    "kimax": 0.5,
+    "fb_every": 1,
+    "safety_try": 0,
+    "sel_w": 0.1,
+    "dls_safety": 1,
+    "fb_clear": 0.0,
+    "fb_cmin": 0.3,
+    "sub_refresh": 0,
+    "fb_block_gain": 0.5,
+    "dump": "ml/runs/round33_both_rows.json",
+    "out": "docs/experiment_round33_both.json",
+    "trace": "ml/runs/round33_both.pt",
+    "select": "endpoint",
+    "replan": "empty",
+    "safety": 1,
+    "partial": 1,
+    "inc_cap": 1,
+    "gap_margin": 0.5,
+    "max_sec": null,
+    "seed": 0,
+    "dls": "analytic",
+    "device": "cuda"
+  },
+  "batch_size": 256,
+  "batch_seed_rule": "same seed per batch",
+  "checkpoint_sha256": "f7f686fd8ee92fb6948fbcc4ee954636065ad87bb54f661c4f8f575bc16c2ce1",
+  "tasks_sha256": "249bd93457825cda98c59e64d9a096d3473c69aeb3553de1dea6d9e56be71772",
+  "kin_fp": "2ebcbf17",
+  "act_scale": 1.0,
+  "metrics": {
+    "n": 256,
+    "n_ref": 256,
+    "success": 0.51953125,
+    "collision_free_success": 0.51953125,
+    "time_ok_1p3": 0.26171875,
+    "collision_rate": 0.0,
+    "collision_steps_mean": 0.0,
+    "travel_ratio_median": 2.5444939136505127,
+    "time_mean_s": 2.4729323387145996,
+    "brakes_mean": 19.97265625,
+    "start_fail": 0.0,
+    "goal_ratio_2s": 0.2868920564651489,
+    "err_fail_med": 202.12567138671875,
+    "err_success_med": 0.22085000574588776,
+    "dls_share": 0.62109375,
+    "time_budget": "teacher×2(≥3 s)",
+    "speed_ratio_p50": 1.0000016689300537,
+    "speed_ratio_p95": 1.0000101327896118,
+    "speed_ratio_max": 1.0000101327896118,
+    "over_vmax_rate": 0.0,
+    "accel_ratio_p95": 1.0000016689300537,
+    "accel_ratio_max": 1.0000101327896118
+  },
+  "simulation_wall_s": 277.54961390000244
+}