- replace hardcoded make -j2 with dynamic CPU core detection in aria2 build.sh
- isolate Aria2 source build cache from prebuilt engine downloads
- add atomic cache validation, restoration, and promotion in scripts/engine-aria2-cache.js
- add Rust dependency and target caching with Swatinem/rust-cache@v2
- raise Desktop checks timeout to 45 minutes to prevent job aborts
- harden temporary directory cleanup on Windows process abort
NimBold