CI: make the Autodesk connector workflow a test gate, ship it on macOS

Three related cleanups to how the bonsaiviewer-autodesk connector is built
and shipped.

build-bonsaiviewer-autodesk.yml no longer builds a bundle. Its four-runner
matrix produced autodesk-<os>-<arch>.zip artifacts that nothing consumed —
shipping happens in the platform pipelines, which each invoke
packaging/build.py themselves. What is left is the crate's only lint and
test coverage, so the workflow is renamed to match what it does and a
header comment records where the shipped binary actually comes from.

build_osx.yml now builds and bundles the connector, which it never did:
macOS users have been getting a Bonsai Viewer with no Autodesk connector at
all. ConnectorDiscovery resolves applicationDirPath()/connectors, which
inside a bundle is Contents/MacOS, so that is where the folder lands.

The tkinter probes in the Windows and Linux workflows are dropped. They
guarded the old PyInstaller connector's Tk GUI (de7520418) and have been
dead since the Rust rewrite (9d9f4054f); python3.11-tkinter goes with them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.github/workflows/build-bonsaiviewer-autodesk.yml

@@ -1,4 +1,9 @@
-name: Build Bonsai Viewer Autodesk Connector
+# Lint/test gate for the bonsaiviewer-autodesk crate — nothing here ships.
+# The connector binary that reaches users is built by the platform pipelines
+# (build_rocky.yml, build_rocky_arm.yml, build_win.yml, build_osx.yml), each
+# of which runs packaging/build.py itself and bundles dist/autodesk/ into the
+# Bonsai Viewer archive.
+name: Test Bonsai Viewer Autodesk Connector
 
 on:
   workflow_dispatch:
@@ -39,55 +44,3 @@ jobs:
 
       - name: cargo test
         run: cargo test --all-features
-
-  build:
-    name: ${{ matrix.os_label }}-${{ matrix.arch }}
-    needs: test
-    runs-on: ${{ matrix.runner }}
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          # Linux: build on the oldest reasonable glibc (Ubuntu 22.04 / glibc
-          # 2.35) so the bundle runs on older distributions.
-          - os_label: linux
-            arch: x86_64
-            runner: ubuntu-22.04
-          # macOS Apple Silicon.
-          - os_label: macos
-            arch: arm64
-            runner: macos-14
-          # macOS Intel. macos-13 is the last Intel runner GitHub provides.
-          - os_label: macos
-            arch: x86_64
-            runner: macos-13
-          # Windows x86_64.
-          - os_label: windows
-            arch: x86_64
-            runner: windows-latest
-
-    defaults:
-      run:
-        working-directory: src/bonsaiviewer-autodesk
-
-    steps:
-      - uses: actions/checkout@v6
-
-      - uses: dtolnay/rust-toolchain@stable
-
-      - uses: Swatinem/rust-cache@v2
-        with:
-          workspaces: src/bonsaiviewer-autodesk
-
-      # python3 is the runner default on all four hosts; packaging/build.py
-      # only uses stdlib (subprocess, shutil, zipfile, pathlib, platform),
-      # no pip-installable deps.
-      - name: Build connector bundle
-        run: python3 packaging/build.py
-
-      - name: Upload connector zip
-        uses: actions/upload-artifact@v7
-        with:
-          name: autodesk-${{ matrix.os_label }}-${{ matrix.arch }}
-          path: src/bonsaiviewer-autodesk/dist/autodesk-${{ matrix.os_label }}-${{ matrix.arch }}.zip
-          if-no-files-found: error