forge: check_lint Counter tally DRY + smoke_check_monotonic probe refactor with fixed verifier fixture

tools/check_lint.py

@@ -72,6 +72,7 @@ import json
 import os
 import re
 import sys
+from collections import Counter
 
 # --------------------------------------------------------------------------
 # Extraction -- mirrors ralph-loop.sh line 24:
@@ -442,13 +443,19 @@ def report(runs: list[dict], as_json: str | None, quiet: bool,
             summary["unknown"] += 1
         if g["class"] == "MISSING":
             summary["no_check_ever"] += 1
-        summary["classes"][g["class"]] = summary["classes"].get(g["class"], 0) + 1
         if g["cross_check"] == "GREEN_BY_CONSTRUCTION":
             summary["green_by_construction"] += 1
         elif g["cross_check"] == "GREEN_DESPITE_FORMATTING":
             summary["green_despite_formatting"] += 1
         if g["extraction_matches_runner"] is False:
             summary["extraction_mismatches"] += 1
+    # `collections.Counter` replaces the hand-rolled tally loop
+    # (`summary["classes"][g["class"]] = summary["classes"].get(g["class"], 0) + 1`):
+    # Counter reads a missing key as 0, so `dict(Counter(...))` yields the same
+    # {class: n} mapping in first-appearance order. Re-assigning the existing
+    # key keeps its position in `summary`, so the SUMMARY repr below and the
+    # json.dump payload are both byte-identical to the pre-refactor output.
+    summary["classes"] = dict(Counter(g["class"] for g in graded))
 
     if not quiet:
         print_rules()