fix: simplify kcl-ci-build and exclude generated workflows from Prettier

Remove wait-for-checks from kcl-ci-build (not needed for this repo).
Add .forgejo/workflows/ to .prettierignore since KCL controls formatting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.prettierignore

@@ -1,2 +1,5 @@
 # Test fixtures should not be formatted to preserve exact output matching
-test/fixtures/
+test/fixtures/
+
+# KCL-generated workflows — formatting is controlled by kcl-ci
+.forgejo/workflows/