ci: add unit tests and e2e_truth to CI pipeline

- Run cargo test --lib in CI checks to execute PLN/ECAN/scorer unit tests
- Add e2e_truth test suite to VPS e2e test step
- Enable OPENBRAIN__TRUTH__ENABLED for e2e testing

.gitea/workflows/ci-cd.yaml

@@ -60,6 +60,7 @@ jobs:
           . "$HOME/.cargo/env"
           cargo check
           cargo test --no-run
+          cargo test --lib
 
       - name: Build release
         run: |
@@ -239,11 +240,13 @@ jobs:
           OPENBRAIN_E2E_REMOTE: "true"
           OPENBRAIN_E2E_BASE_URL: http://${{ secrets.VPS_HOST }}:3100
           OPENBRAIN__AUTH__ENABLED: "true"
+          OPENBRAIN__TRUTH__ENABLED: "true"
         run: |
           set -euxo pipefail
           export OPENBRAIN_E2E_API_KEY="$(cat .ci/openbrain_e2e_key)"
           . "$HOME/.cargo/env"
           cargo test --test e2e_mcp -- --test-threads=1
+          cargo test --test e2e_truth -- --test-threads=1
 
       - name: Remove ephemeral e2e key and restart service
         if: always() && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master')