CVE-2026-70378 imagecli: Negative carve Ratio Bypasses Bounds Check and Crashes Process via Reachable Panic

imagecli's carve pipeline operation Carve::apply in src/imageops.rs only asserts ratio = 1.0, never validating that the ratio is positive. A negative ratio e.g. -5 causes the computed target width to saturate to 0 via Rust's defined float-to-uint cast, which is then passed to...