Ladder 06/017: the golden entry from a run of the case

Ladder 06/017's golden entry was edited by hand when the chamfered tip moved to ISO 724's d3.
Re-measured by running the case (solidcraft-cli kernel-cases on SMLib): its counts, area and
volume are the ones written by hand; its time is the run's. The tier's order by time holds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/kernel-cases/ladder/golden.json

@@ -993,7 +993,7 @@
         "vertices": 172,
         "volume_mm3": 1945.3543465077544
       },
-      "seconds": 3.293720875,
+      "seconds": 3.048846709,
       "status": "pass"
     },
     "ladder/06-threads/018-external-m10-both-hands": {