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## Summary - always wrap NWN model compilation with `xvfb-run`, even when the caller has `DISPLAY` - fail closed with an actionable error when `xvfb-run` is unavailable instead of opening the client UI - update the compiler contract and regression coverage ## Verification - focused red/green regression tests - `nix develop -c make check` - real NWN compile with `DISPLAY=:0` under transient Xvfb; binary MDL output verified Generated with Claude CodeReviewed-on: #49 Co-authored-by: vickydotbat <vickydotbat@tutamail.com>