fvtk 9.6.2.0rc2

Pre-release to validate PyPI publishing for both fvtk and fvtk-sdk across every platform after the SDK build fixes. 9.6.2.0rc1 published fvtk but the fvtk-sdk upload failed; this confirms both land at the same version.

Packaging

• fvtk-sdk now builds and publishes for Linux x86_64, Linux aarch64, macOS arm64, and Windows x64 (#108, #110).
• Linux aarch64 (manylinux_2_28_aarch64) wheels added for both fvtk and fvtk-sdk (#111).
• SDK wheels are tagged py3-none-manylinux_2_28_*, so one wheel per platform serves CPython 3.12+ (#108).

CI

• The SDK build runs behind a single required SDK gate check (#113).
• The Windows release wheel sets up MSVC vcvars (#107).

Fixes

• Honor depth-format changes when reallocating vtkTextureObject depth (#105).
• FVTK_KEEP_CLASSES re-includes trimmed classes on demand (#106).