41b7e9a049
One-time, mechanical reformat — no functional changes. The tree was not rustfmt-clean (~1800 hunks across ~100 files); this brings it to stock `cargo fmt` defaults so a `cargo fmt --check` CI gate can follow. Behaviour-preserving: 2509 pass / 0 fail / 1 ignored (unchanged baseline), clippy clean. A .git-blame-ignore-revs entry follows so `git blame` skips this commit.