oxidize-pdf: NaN/inf bypass in colour content-stream emission causes PDF rejection (DoS)
### Impact `oxidize-pdf` defines `Color` as a `pub enum` with public tuple-struct variants `Rgb(f64, f64, f64)`, `Gray(f64)`, and `Cmyk(f64, f64, f64, f64)`. The constructors `Color::rgb`, `Color::gray`, and `Color::cmyk` clamp incoming components to `[0.0, 1.0]`, but because the variants are `pub`, callers can construct values directly without going through the constructors: ```rust let safe = Color::rgb(f64::NAN, 0.5, 0.5); // clamps NaN to 0.0 let attack = Color::Rgb(f64::NAN, 0.5, 0.5); // bypasses clamp Color: Copy allows the non-finite value to propagate freely through API surfaces and serialisation. When such a va
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