[wieslawsoltes]

Closes #826.

Change

• refresh the CSS property identity assertions against the generated catalog
• keep script-created animation bookkeeping inside the existing lazy document auxiliary allocation
• preserve the 384-byte native_document ABI/footprint budget on Windows

Stack

• Export bounded desktop and media host APIs #823
• Repair CSS custom property native compilation #824
• this PR

Validation

• git diff --check
• the exact Linux/Windows package build that exposed this regression will run once on the completed top of the repair stack
• local macOS CMake generation is unavailable with the host AppleClang module dependency scanner; no redundant package build was started