diff --git a/tests/robustness/goldens.json b/tests/robustness/goldens.json
index ff06222b..ecfd5fba 100644
--- a/tests/robustness/goldens.json
+++ b/tests/robustness/goldens.json
@@ -14,7 +14,7 @@
   "10": {"area":2809.248846,"bodies":1,"edges":39,"error":null,"faces":16,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut box","fillet","hole"],"unsupported":0,"volume":6696.329905},
   "11": {"area":7858.300481,"bodies":1,"edges":33,"error":null,"faces":13,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","hole","rectangular pattern","fillet"],"unsupported":0,"volume":34605.048259},
   "12": {"area":4668.664174,"bodies":2,"edges":59,"error":null,"faces":25,"outcome":"ok","rejected":0,"shells":2,"steps":["extruded profile","chamfer","join cylinder","join box","cut cylinder","circular pattern"],"unsupported":3,"volume":11874.471611},
-  "13": {"area":2101.521015,"bodies":1,"edges":101,"error":null,"faces":40,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut cylinder","join box","rectangular pattern","cut cylinder","cut box","fillet","hole"],"unsupported":0,"volume":2396.939548},
+  "13": {"area":2101.521015,"bodies":1,"edges":103,"error":null,"faces":41,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut cylinder","join box","rectangular pattern","cut cylinder","cut box","fillet","hole"],"unsupported":0,"volume":2396.939546},
   "14": {"area":10553.267409,"bodies":1,"edges":43,"error":null,"faces":20,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","cut cylinder","shell","fillet"],"unsupported":0,"volume":10369.008764},
   "15": {"area":2312.730168,"bodies":1,"edges":39,"error":null,"faces":15,"outcome":"ok","rejected":2,"shells":1,"steps":["revolved section","cut box","rectangular pattern","cut sphere","cut cylinder","cut sphere","join cylinder"],"unsupported":0,"volume":5728.661237},
   "16": {"area":8872.873884,"bodies":3,"edges":49,"error":null,"faces":23,"outcome":"ok","rejected":0,"shells":3,"steps":["box","join cylinder","circular pattern","hole"],"unsupported":0,"volume":44953.403148},
@@ -72,7 +72,7 @@
   "68": {"area":7338.675126,"bodies":1,"edges":36,"error":null,"faces":14,"outcome":"ok","rejected":2,"shells":1,"steps":["extruded profile","hole","hole","rectangular pattern","rectangular pattern","fillet","circular pattern"],"unsupported":0,"volume":29780.741772},
   "69": {"area":6451.122767,"bodies":1,"edges":60,"error":"offset: a corner whose faces don't meet the same way after t","faces":27,"outcome":"failed","rejected":0,"shells":3,"steps":["revolved section","join box","shell","shell"],"unsupported":0,"volume":4761.477515},
   "70": {"area":3682.669157,"bodies":1,"edges":24,"error":"lumps: shell boundaries intersect or touch; cavity ownership","faces":12,"outcome":"failed","rejected":0,"shells":2,"steps":["extruded profile","join box","hole"],"unsupported":1,"volume":9155.027162},
-  "71": {"area":3980.574721,"bodies":1,"edges":50,"error":null,"faces":19,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","cut box","cut cylinder","hole","join cylinder"],"unsupported":0,"volume":15749.927796},
+  "71": {"area":3980.574721,"bodies":1,"edges":52,"error":null,"faces":20,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","cut box","cut cylinder","hole","join cylinder"],"unsupported":0,"volume":15749.927814},
   "72": {"area":5770.270336,"bodies":2,"edges":44,"error":null,"faces":20,"outcome":"ok","rejected":1,"shells":2,"steps":["box","join cylinder","hole","join box","join box","cut box","cut cylinder","cut cylinder"],"unsupported":0,"volume":16081.801492},
   "73": {"area":6868.162117,"bodies":1,"edges":40,"error":"offset: a corner whose faces don't meet the same way after t","faces":18,"outcome":"failed","rejected":0,"shells":1,"steps":["extruded profile","join box","shell"],"unsupported":1,"volume":36461.939381},
   "74": {"area":9294.57311,"bodies":1,"edges":18,"error":null,"faces":9,"outcome":"ok","rejected":0,"shells":1,"steps":["box","hole"],"unsupported":0,"volume":55866.183074},
@@ -95,7 +95,7 @@
   "91": {"area":3958.046518,"bodies":1,"edges":50,"error":null,"faces":20,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut cylinder","fillet"],"unsupported":0,"volume":9721.244548},
   "92": {"area":2855.139217,"bodies":1,"edges":30,"error":null,"faces":12,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","chamfer","cut sphere"],"unsupported":0,"volume":9814.30292},
   "93": {"area":7266.404017,"bodies":7,"edges":111,"error":null,"faces":51,"outcome":"ok","rejected":0,"shells":7,"steps":["extruded profile","fillet","chamfer","join box","circular pattern","rectangular pattern","cut cylinder"],"unsupported":0,"volume":12734.393171},
-  "94": {"area":3480.70333,"bodies":1,"edges":63,"error":null,"faces":27,"outcome":"ok","rejected":1,"shells":2,"steps":["revolved section","cut cylinder","fillet","hole","rectangular pattern","cut box","cut box"],"unsupported":0,"volume":5456.446856},
+  "94": {"area":3480.70333,"bodies":1,"edges":61,"error":null,"faces":26,"outcome":"ok","rejected":1,"shells":2,"steps":["revolved section","cut cylinder","fillet","hole","rectangular pattern","cut box","cut box"],"unsupported":0,"volume":5456.446856},
   "95": {"area":2425.131626,"bodies":1,"edges":19,"error":"boolean Cut: the operation failed: no result; the operation ","faces":9,"outcome":"failed","rejected":0,"shells":1,"steps":["revolved section","hole","fillet","cut cylinder","cut sphere"],"unsupported":0,"volume":7106.301922}
  },
  "notes": [
@@ -127,12 +127,13 @@
   {"reason":"#1490: when the last-resort nudge fails both ways, two more screw axes are tried; seed 63's final box join (its face 0.00005 mm off the half-ring's cut face) now builds instead of being refused with an implausible volume, and the design goes on to its fillet","seeds":[63]},
   {"reason":"a prism cut in a column round the tool (prism_local): seed 65's rectangular pattern (step 4, a second half-cylinder groove overlapping the first, in a block with a rounded vertical edge) is now built by the exact 2D route in a column clear of the round, where the B-rep tries left it with split edges. The step's part has the 10 faces, 24 edges and 16 vertices it should (28 edges and 18 vertices before), and its volume is 45145.383 mm³ against 45145.214 (exactly 45145.103, both within the mesh measure); the generator then picks other edges for its step 7 fillet, so the run ends on another design (45143.48 mm³, 15 faces)","seeds":[65]},
   {"reason":"Seed 31: #1581 no longer maps a pick on an earlier round's seam to some other nearby edge; the second fillet's selection includes the smooth seam at [2, 27.5, 13.5] beside the first round, which is now refused (no corner to round) instead of silently re-rounding a different edge at 1 mm, so the run goes on to a hole. Seed 83: #1316 was recorded before its branch took in #1495; with #1495's shell (an open face next to a concave edge no longer cuts the wall past it) the shelled part keeps more wall (6217 to 6339 mm3), its edges differ, and the 2.5 mm fillet of the first run is not picked; a later fillet is refused as not supported yet (an end face parallel to the edge)","seeds":[31,83]},
-{"reason":"the 2D route sews a cut whose outline has a point a hair from a segment's end (text-recut): seed 53's shell (step 3, a 2 mm shell of an extruded L with an arc side, opened at the notch's inner face) builds its cavity by the 2D route in 77 ms, where it took the B-rep path (2.4 s) and gave a part 336 mm³ lighter, which a box can't then be intersected with (no result). Its section at mid height is 338.27 mm² (a distance-rule raster of the profile gives 343.7, rounding the cavity's concave corners); the generator then builds the step 4 fillet it refused before, so the run goes on another way (16954.55 mm³, 48 faces)","seeds":[53]},
+  {"reason":"the 2D route sews a cut whose outline has a point a hair from a segment's end (text-recut): seed 53's shell (step 3, a 2 mm shell of an extruded L with an arc side, opened at the notch's inner face) builds its cavity by the 2D route in 77 ms, where it took the B-rep path (2.4 s) and gave a part 336 mm³ lighter, which a box can't then be intersected with (no result). Its section at mid height is 338.27 mm² (a distance-rule raster of the profile gives 343.7, rounding the cavity's concave corners); the generator then builds the step 4 fillet it refused before, so the run goes on another way (16954.55 mm³, 48 faces)","seeds":[53]},
   {"reason":"#726 (#1687): a full revolve of a profile off the axis comes out with its planar faces whole, so the revolved section has fewer faces and edges. The fuzz generator picks edges and faces by index, so from their second step these seeds build different designs. Replaying each new design's commands on main and on this branch: seeds 45, 77 and 94 end the same; in seed 21 a box joined onto the ring's flat top now fuses with it, where main kept two touching shells that a later hole split into two bodies.","seeds":[21,45,77,94]},
   {"reason":"#726 (#1718): a partial revolve made as a new body comes out with its planar faces whole, so the revolved section has fewer faces and edges. The fuzz generator picks edges and faces by index, so from their second step these seeds build different designs (seed 24's shell now picks the centroid of a whole 270 deg annulus, which lies in the bore, so it is refused and the run goes on). Replaying each new design's commands on main and on this branch: 12 seeds end the same; in seeds 13 and 26 a box joined onto a flat revolved face now fuses with it (main kept two touching shells that a later step split into two bodies), seed 15's last cylinder join, which main refuses, now builds, and seed 78's cut box no longer leaves 87.5 mm² of extra area (the end cap's); seed 63 refuses the same fillet on both and ends with nearly the same body. Seed 9 now ends ok instead of failing, but its new design ends the same on main. No seed gains a failure.","seeds":[9,10,13,15,17,19,22,24,25,26,30,63,75,76,78,90,91]},
   {"reason":"Current main replay: seed 55 now meshes every face and passes validity; edge-consistent measuring meshes (#1753) change its measured volume from 24741.239331 to 24740.927259 mm3. Seed 71 joins with one fewer redundant face and two fewer edges (19/50); its five steps, successful outcome, volume and area are unchanged within the existing 1e-6 tolerances. Both fixed command sequences were replayed with validity checks after every step.","seeds":[55,71]},
   {"reason":"Seed 20: trace conical cutters against earlier conical cuts at finer unshifted tolerances before coarse copies can leave unusable junctions. The circular pattern and final box cut both build; replayed in the app with no feature errors, unchanged 45 faces/116 edges/one shell, no tool nudge, and volume/spatial guards retained. The finer intersection curves change measured volume by 0.020503 mm3 and area by 0.171629 mm2.","seeds":[20]},
   {"reason":"After integrating #1718, replay the regenerated revolved-section recipes on the combined branch: seed 13 has 40 faces/101 edges (one face/two edges fewer), seed 94 has 27 faces/63 edges (one face/two edges more). Both complete fixed command sequences pass validity and volume-direction checks after every step, and two independent golden runs per seed agree exactly. Steps, outcomes, body and shell counts are unchanged; area and volume match within existing 1e-6 relative tolerances (seed 13 volume differs by 0.000002 mm3). Only topology counts are updated. The finer unshifted conical-cut route and its geometry guards remain in place.","seeds":[13,94]},
-  {"reason":"#1670 and #1753 (mesh export: twisted ruled faces divided to the chord tolerance, and the faces of an edge sharing its points exactly) change the meshes the kernel's validity and volume checks measure: seed 55's body (a filleted box cut by spheres and patterned) now passes the validity check it failed, and its volume moves by 1.3e-5 relative. Pull requests ran only every 8th seed, so main's full run found it. Recorded from main's CI output (Linux).","seeds":[55]}
+  {"reason":"#1670 and #1753 (mesh export: twisted ruled faces divided to the chord tolerance, and the faces of an edge sharing its points exactly) change the meshes the kernel's validity and volume checks measure: seed 55's body (a filleted box cut by spheres and patterned) now passes the validity check it failed, and its volume moves by 1.3e-5 relative. Pull requests ran only every 8th seed, so main's full run found it. Recorded from main's CI output (Linux).","seeds":[55]},
+  {"reason":"#853 recorded seeds 13, 71 and 94 as its own branch built them (13: 40 faces/101 edges, 71: 19/50, 94: 27/63), but with main's kernel they build as before (41/103, 20/52, 26/61), so every full run on main failed on them after #853 landed. This puts back the counts main builds; #853's conical-cut refinement (seed 20) is unchanged. Steps, outcomes, volumes and areas are the same.","seeds":[13,71,94]}
  ]
 }