Fix CI schema check to not reference deleted docs/schema.json

Author: nicosuave

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
       - name: Check JSON Schema is up to date
         run: |
           uv run python scripts/generate_schema.py
-          if ! git diff --exit-code sidemantic-schema.json docs/schema.json; then
+          if ! git diff --exit-code sidemantic-schema.json; then
             echo "JSON Schema is out of date. Run 'uv run python scripts/generate_schema.py' and commit the changes."
             exit 1
           fi