Add scripts/slint-dev-fast.sh: a DEBUG (non-release) build for quick visual
iteration — opt-level 0 so the giant Slint-generated module skips the heavy
LLVM passes, plus the mold linker, no debuginfo, and the nightly parallel
frontend. It builds into target/debug, separate from the release cache.
slint-dev.sh (release, kept for perf measurement) gains the mold linker and
bumps the frontend threads 8 -> 16 — both only cut compile time, the optimised
binary is unchanged.
cc
slint-dev.sh runs qbz-slint via 'cargo +nightly run --release -Z threads', splitting the serial compile of the Slint-generated module across cores while producing an identical optimized release binary (no cranelift). RUSTFLAGS re-lists the AES-NI features from .cargo/config.toml since RUSTFLAGS overrides rather than merges it.
cc
vicrodh