zaml - a Zig NIF YAML parser for Elixir

announcing zaml 0.2.0 — a Zig NIF YAML 1.2 parser for Elixir that wraps libyaml and ships with two performance wins over the existing native option on Hex:

1. Single-shot map construction. Maps are built with one enif_make_map_from_arrays call instead of a per-pair enif_make_map_put, eliminating the O(n²) rehashing that dominated wide maps. This is most of the gain over fast_yaml on the flat 1M-key fixture.
2. Zero-copy scalar sub-binaries. String scalars are returned as sub-binaries of the input rather than copied into freshly allocated binaries. The path is bounds-checked with a copy fallback, so it stays correct across libyaml versions that may write quoted/block scalars into their own buffer.

Headline numbers (Apple M3 Pro, avg of 5 runs):
Parser 1M-line flat 100k-key nested
zaml 0.2.0 0.84 s 0.53 s
fast_yaml 1.0.40 2.54 s 1.86 s
yamerl 0.10.0 30.27 s 23.88 s

This release also fixes anchors and aliases end-to-end — &name / *name now resolve, with anchor names copied into a parse-scoped arena because libyaml frees its event buffer after each event.

Build needs Zig 0.16+ and libyaml dev headers; mix.exs auto-detects Homebrew/Linux locations and injects the right CFLAGS/CPPFLAGS/LDFLAGS for rebar3-compiled deps.