724c12ac16
The custom_wiki2html test added in 23aec3e had an over-width `assert!`
that `cargo fmt` wants wrapped; CI's `cargo fmt --all -- --check` job has
been failing on it since. No behavior change — `cargo fmt --all` only.
Verified locally against the exact CI matrix: fmt --check clean, clippy
--workspace --all-targets -D warnings clean, test --workspace --all-targets
all pass, keymap + config harnesses pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>