Create full install pipeline (plan task 21): - src/tofu/recipeparse.d: light .recipe Lua parser (parseRecipeFile) - src/tofu/commands/install.d: installCommand with delegate seams - 8 unit tests covering: happy path, not-found, dep cycle, build failure, install failure, --dry-run, --noconfirm, user abort - All 21 modules pass dub test, dub build passes - Evidence: .omo/evidence/task-21-tofu-core.log