Hojun-Cho
f3743b3c7f
The four test/lang/*_test.ww in-language @test files had no make target running them — dead coverage that could rot silently. Add a standalone test-lang target running each through the cstage `ww test` subcommand (one package per invocation; set -e gives the gate teeth). Imports resolve via the driver's self_dir/../../lib fallback, so no lib env. Kept out of make test/test-unit/test-commit: that wiring is fold 6 and is gated on the T1 behavior corpus reaching parity before byte-id is demoted to pre-push.