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DecInt should format integers without the itoa crate and fix edge-case panics

DecInt should format integers without the itoa crate and fix edge-case panics: a task in LegoFlow-SWE (Harbor dataset). The DecInt type in rustix::path is used to render integers as decimal, NUL‑terminated byte strings for OS‑path/argument contexts – e.g. embedding file descriptors in UNIX socket…

The task

The `DecInt` type in `rustix::path` is used to render integers as decimal, NUL‑terminated byte strings for OS‑path/argument contexts – e.g. embedding file descriptors in UNIX socket paths or writing an `i32` sum to a socket without intermediate `String` allocation.

Part of Lego-X/LegoFlow-SWE.