[w1ne]

Summary

examples/robot-arm/skill-built-supported-arm.kcad.ts failed evaluate with union.disconnected. The fast smoke suite exempted it with the reason "dedicated authoring test covers this existing hinge visibility failure". That reason is stale: tests/integration/examples/skillBuiltSupportedArm.test.ts is an it.skip placeholder, so the example had no evaluate coverage.

Reproduction (origin/develop 80f7542be)

npx tsx src/agent/cli/index.ts evaluate examples/robot-arm/skill-built-supported-arm.kcad.ts
ERROR [union.disconnected] ...:45:4: union() result is 6 separate solids ...
  box_12 gap 1 mm; box_13/box_14 gap 3.5 mm; box_15/box_16 gap 7.5 mm
WARN  [union.disconnected] ...:67:4: union() result is 5 separate solids ... touching but not fused

Change

• Upper link: one shoulder hub (14 x 29 x 14 mm) spans both pin cheeks and overlaps the beam start. It stays 2 mm inside the turret yoke (y ±16.5). The elbow cheeks now run back to a 6 mm cross bridge that ends at x = 103, the same limit as the existing beam, outside the 12 mm swing radius of the forearm root.
• Gripper palm: the palm runs 1 mm into the hinge lugs (x 107 to 108). A finger at its 30° limit still clears the palm face by 1.75 mm.
• Connectors, mates, limits and parameters are unchanged.
• The example is removed from EVALUATION_EXEMPT, so the fast smoke suite evaluates it.

Results

• evaluate: before exit 1 (1 error, 1 warning); after exit 0, OK.
• npx vitest run tests/integration/fast/exampleParseSmoke.test.ts -t "supported-arm|classifies": 5 passed, including skill-built-supported-arm.kcad.ts evaluates cleanly (1.6 s).
• validate --include-interference, before and after: exit 2 both times, with the same mechanism findings (shoulder mate gap 2.0 mm, finger mate gap 1.5 mm, coupling residual, drops-on-release; tracked by Example examples/robot-arm/skill-built-supported-arm.kcad.ts fails the physics-grounded loop #352). No interference finding before or after. Diff of the two reports: the palm-to-finger-pivot distance drops from 4.0 to 3.0 mm, and the free passive finger drift changes from 228 to 229 mm.
• npx eslint on the changed test file: clean.

Not done

• Example examples/robot-arm/skill-built-supported-arm.kcad.ts fails the physics-grounded loop #352 (mechanism gate) stays open. This PR fixes only the solid connectivity.
• Follow-ups seen during triage, not in this PR: print-prep/wall-hook.kcad.ts fails at its documented dfm.fdm.overhang-unsupported gate and could move to EXPECTED_FAILURE. The kinematic/luxo-lamp.kcad.ts exemption reason is also stale: it now fails on union.member-overlap and union.disconnected, not hinge visibility.

🤖 Generated with Claude Code

Demo handoff

• Demo bundle README
• Six-second MP4
• Capture settings and verification

Local kernelcad render inspect remains unavailable because Playwright Chromium is absent. The hosted preview and MP4 provide visual geometry evidence only; the preview reports #352 joint diagnostics, and no mechanism pass is claimed. The video caption states that five targeted smoke checks passed and that verification was skipped. The bundle retains the raw turntable, caption source, rendering script, source hash, and inspected frame.