bench: let the verdict govern the report, and put the caliber in the table

A pair judged incomparable was still followed by a speedup range on the next
line. A NO_TRITON pair's range says nothing about the switch — nothing reached
the compiler — and a NO_IR_DIFF pair's range is the machine's noise floor for
that operator, which is useful but is not a result. Printing either unlabelled
produces exactly the thing this tooling exists to prevent: a table that looks
like a finding. NO_ROWS and NO_TRITON now print no range; NO_IR_DIFF prints one
and says what it is — how far it sits from zero is the confidence floor for a
single measurement of that operator.

screen.tsv gains the seven caliber columns, read back through
`batch_summary.py --caliber`, so CALIBER_FIELDS stays the single definition and
the screening table does not restate it. Two screen.tsv files taken at
different --level are otherwise indistinguishable side by side, and those
columns are the only thing that would stop the comparison.

batch_summary.py

@@ -485,10 +485,17 @@ def main() -> None:
                    help="多轮 A/B 目录，含 r<k>_A/run.log 与 r<k>_B/run.log；"
                         "逐 shape 取轮次中位，并报逐轮区间与符号稳定性")
     p.add_argument("--label", default="", help="--ab / --ab-rounds 报告里的算子名")
+    p.add_argument("--caliber", type=Path, default=None, metavar="RUN_DIR",
+                   help="打印该 run 的口径字段（TSV 一行），供筛选表复用")
     p.add_argument("--allow-caliber-mismatch", action="store_true",
                    help="口径不一致时仍出报告（默认拒绝）。只在确认两次运行"
                         "确实可比时使用")
     args = p.parse_args()
+    if args.caliber is not None:
+        # 口径的定义只有 CALIBER_FIELDS 一处；筛选表等复用它，不要在别处重列
+        cal = caliber_of(args.caliber) or {}
+        print("	".join(str(cal.get(k, "")) for k in CALIBER_FIELDS))
+        return
     if args.ab_rounds:
         if not args.ab_rounds.is_dir():
             raise SystemExit(f"目录不存在: {args.ab_rounds}")