Go-duration, boolean and size parsing are pure functions of their input and belong beside the flag derivation, not inline in the entry point. Moves the eight parsers and the four tests that pin their upstream semantics. main.zig 1416 -> 1263 lines. The 856-line `pub fn main` is untouched: that is argument dispatch and wiring, and collapsing it onto ServeOptions is a behavioural change that deserves its own pass rather than riding along with a file move. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>