phase_1_parse_gate

Katz 0.071

Make dishonesty impossible.
Add a build step that runs the Langium parser over every language- " rq " block
in showcase content files and fails on parse errors or unresolved local refs.
Do this first so the rewrite cannot reintroduce the current problem.
Also expand Shiki language set per showcase_languages.

priority

P0

status

done

Interactive page: phase_1_parse_gate