[itsgrimetime]

Use typed callback and payload unions in the stage animation dispatcher so pointers retain their native width and every argument kind uses the SDK's exact signature without casts. Type the first-animation search callback and make its result pointer volatile across longjmp.

Validation: 100% matching; the final DOL is byte-identical to master. ARM64 -O2 ASan/UBSan checks cover all 12 callback signatures through the production stage and SDK walkers, plus 2,048 animation search cases.