fix(ci): remove redundant check-mocks step that was killing CI

The standalone "Check mocks are up to date" step ran build_runner AOT
compilation separately, then task check ran it again (check-mocks is
already a dep of check). The double invocation caused the build_runner
AOT compile to receive SIGTERM on the CI runner in run 4027578.

task check already verifies mocks via its check-mocks dep, so the
standalone step is redundant.

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

.forgejo/workflows/ci.yml

@@ -21,9 +21,6 @@ jobs:
           mkdir -p ~/.config/nix
           echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
 
-      - name: Check mocks are up to date
-        run: nix develop --no-warn-dirty --command task check-mocks
-
       - name: Run Full Check Suite
         run: nix develop --no-warn-dirty --command task check