Wave 292/509: STEP import: a refused solid comes in as a surface body of its exact faces (and 3 more)

4 commits, squashed; the originals stay reachable from tag archive/merge-main-develop.

- fd5319a0e jyviko: docs: the kernel's move from truck to SMLib, as written up on #4012
- 4cb0d6ee9 jyviko: STEP import: a refused solid comes in as a surface body of its exact faces
- e19785620 jyviko: STEP import: a refused solid's surface body faces as the file has it
- 529fb7cf3 jyviko: Release: macOS builds on macos-15 (GitHub retires macos-14 on 2026-11-02)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DtL5M41G8Nua7HvuFPZkmJ

.github/workflows/release.yml

@@ -316,7 +316,7 @@ jobs:
     name: macOS build ${{ matrix.arch }}
     needs: version
     if: needs.version.outputs.build == 'true'
-    runs-on: macos-14
+    runs-on: macos-15
     strategy:
       fail-fast: false
       matrix:
@@ -353,7 +353,7 @@ jobs:
     name: macOS universal
     needs: [version, macos-build]
     if: needs.version.outputs.build == 'true'
-    runs-on: macos-14
+    runs-on: macos-15
     env:
       SOLIDCRAFT_VERSION: ${{ needs.version.outputs.version }}
       SOLIDCRAFT_BUILD_DATE: ${{ needs.version.outputs.date }}