bonsaiviewer-autodesk: replace Python connector with the Rust impl

The Python implementation of the Autodesk Forma connector
(bonsaiviewer_autodesk/) is deprecated. The Rust port that's been
maturing under src/bonsaiviewer-autodesk-rs/ is now the connector
and takes over the original folder name.

## File operations

* `git rm -r src/bonsaiviewer-autodesk` — drop the 18 tracked Python
  source/test/packaging files. (~6.5k untracked build artefacts in
  venv/build/dist/egg-info are removed too, but those were never in
  the index.)
* `mv src/bonsaiviewer-autodesk-rs src/bonsaiviewer-autodesk` —
  the Rust impl takes over the canonical folder name.
* `rm -rf src/bonsaiviewer-autodesk-rs-egui` — abandoned egui-based
  experiment, never committed.
* `src/bonsaiviewer-autodesk/.gitignore` extended with `/dist` to
  keep packaging output out of the index alongside the existing
  `/target` rule.

The Rust binary in Cargo.toml already has `name = "bonsaiviewer-
autodesk"` and `connector.json`'s `exec` field already points at that
name — so the connector loader, build_viewer.sh symlink, and
win/build-all-win.py CONNECTOR_DIR all keep working without edits.

## Packaging shape preserved

`packaging/build.py` is rewritten to:

  * shell out to `cargo build --release` instead of pyinstaller,
  * copy the produced binary + connector.json into the same
    `dist/autodesk/` layout the PyInstaller flow produced,
  * zip into `dist/autodesk-<os>-<arch>.zip` with the same
    naming pattern (CI artifact uploads keep working).

The Rust binary statically links its deps, so unlike PyInstaller
there's no `_internal/` directory — single executable inside
`dist/autodesk/`. Everything downstream (`build_viewer.sh` symlink,
`win/build-all-win.py collect_connector_files`, the zip step in
`build_rocky.yml`) only cares that `dist/autodesk/` exists, so the
on-disk contract is preserved.

Verified locally: `python3 src/bonsaiviewer-autodesk/packaging/build.py`
produces `dist/autodesk/{bonsaiviewer-autodesk, connector.json}`
(3.9 MB stripped ELF) and `dist/autodesk-linux-x86_64.zip` (~1.5 MB
compressed).

## CI updates

* `.github/workflows/build_rocky.yml` and `build_rocky_arm.yml`:
  drop the `pip install ".[build]"` step — `packaging/build.py` is
  stdlib-only now, the cargo build wrapped inside it does the work.
* `.github/workflows/build_win.yml`: same — drop pip install,
  packaging script handles cargo internally.
* `.github/workflows/build-bonsaiviewer-autodesk.yml`: full rewrite
  of the dedicated connector test/build workflow. Replaces the
  Python {3.11, 3.13} test matrix with `cargo fmt --check`,
  `cargo clippy --all-targets -- -D warnings`, and `cargo test
  --all-features`. The OS/arch build matrix is unchanged
  (linux-x86_64, macos-arm64, macos-x86_64, windows-x86_64) but
  installs a Rust toolchain via dtolnay/rust-toolchain@stable and
  caches target/ via Swatinem/rust-cache.

`win/build-all-win.py` and `build_viewer.sh` are unchanged — they
only reference the `dist/autodesk/` path, which the new
`packaging/build.py` populates identically.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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

@@ -13,14 +13,8 @@ on:
 
 jobs:
   test:
-    name: test-py${{ matrix.python-version }}
+    name: cargo-test
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        # Exercise the floor and a current version of the supported range
-        # (pyproject requires-python = ">=3.11").
-        python-version: ['3.11', '3.13']
 
     defaults:
       run:
@@ -29,20 +23,22 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: actions/setup-python@v6
+      - uses: dtolnay/rust-toolchain@stable
+
+      # cargo-target reuse across runs. Massive cold-build speedup,
+      # cheap on the GitHub Actions cache budget.
+      - uses: Swatinem/rust-cache@v2
         with:
-          python-version: ${{ matrix.python-version }}
+          workspaces: src/bonsaiviewer-autodesk
 
-      # The connector imports tkinter/customtkinter (via the test suite's
-      # connector coverage), so fail loudly here if Tk is missing.
-      - name: Verify tkinter is available
-        run: python -c "import tkinter; print('Tk', tkinter.TkVersion)"
+      - name: cargo fmt --check
+        run: cargo fmt --all -- --check
 
-      - name: Install package and test deps
-        run: python -m pip install ".[test]"
+      - name: cargo clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings
 
-      - name: Run pytest
-        run: python -m pytest -q
+      - name: cargo test
+        run: cargo test --all-features
 
   build:
     name: ${{ matrix.os_label }}-${{ matrix.arch }}
@@ -77,21 +73,17 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: actions/setup-python@v6
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
         with:
-          python-version: '3.12'
-
-      # actions/setup-python ships Python with tkinter on all three OSes via
-      # python-build-standalone, but verify so a missing-tk regression fails
-      # the build loudly instead of inside PyInstaller.
-      - name: Verify tkinter is available
-        run: python -c "import tkinter; print('Tk', tkinter.TkVersion)"
-
-      - name: Install package and build deps
-        run: python -m pip install ".[build]"
+          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: python packaging/build.py
+        run: python3 packaging/build.py
 
       - name: Upload connector zip
         uses: actions/upload-artifact@v7

.github/workflows/build_rocky.yml

@@ -89,7 +89,11 @@ jobs:
         shell: bash
         run: |
           VERSION=v`cat VERSION`
-          python3.11 -m pip install "src/bonsaiviewer-autodesk[build]"
+          # bonsaiviewer-autodesk is now a Rust connector. packaging/build.py
+          # invokes `cargo build --release` and stages the binary +
+          # connector.json into dist/autodesk/. Same on-disk shape as the
+          # old PyInstaller flow so the symlink + zip steps below
+          # continue to work unchanged.
           python3.11 src/bonsaiviewer-autodesk/packaging/build.py
           autodesk_connector_dir="$PWD/src/bonsaiviewer-autodesk/dist/autodesk"
           test -d "$autodesk_connector_dir"

.github/workflows/build_rocky_arm.yml

@@ -89,7 +89,11 @@ jobs:
         shell: bash
         run: |
           VERSION=v`cat VERSION`
-          python3.11 -m pip install "src/bonsaiviewer-autodesk[build]"
+          # bonsaiviewer-autodesk is now a Rust connector. packaging/build.py
+          # invokes `cargo build --release` and stages the binary +
+          # connector.json into dist/autodesk/. Same on-disk shape as the
+          # old PyInstaller flow so the symlink + zip steps below
+          # continue to work unchanged.
           python3.11 src/bonsaiviewer-autodesk/packaging/build.py
           autodesk_connector_dir="$PWD/src/bonsaiviewer-autodesk/dist/autodesk"
           test -d "$autodesk_connector_dir"

.github/workflows/build_win.yml

@@ -75,11 +75,12 @@ jobs:
 
       # Build the Autodesk connector before the C++ build: build-all-win.py
       # bundles it next to BonsaiViewer.exe while archiving the executables.
+      # bonsaiviewer-autodesk is a Rust connector; packaging/build.py runs
+      # `cargo build --release` and stages the binary + connector.json into
+      # dist/autodesk/ — same layout the old PyInstaller flow produced.
       - name: Build Autodesk connector
         working-directory: src/bonsaiviewer-autodesk
-        run: |
-          python -m pip install ".[build]"
-          python packaging/build.py
+        run: python packaging/build.py
 
       - name: Run Build Script And Pack .zip Archives
         shell: cmd