perf: reuse environment entries across process spawns - #22
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Reuse cached environment strings when setting Dune's process temp directory, including the absent-variable Unix path and case-insensitive Windows variables.\n\nFor 1,000 variables on current ocaml/main, present-variable serialization falls from 22.07 us / 8.08k minor words to 4.52 us / 2.52k words. The absent-variable path falls from 21.91 us / 8.10k words to 115 ns / about 6 words.\n\nBuilds on the per-binding renderer from ocaml#15688; this avoids reconstructing the binding list per spawn.