CI calls the shared test workflow (Track Q): OpenVibe.Shared test.yml@e8b0caf (install, node --check, npm test, openvibe-contracts-check; ffmpeg where the tests need it) instead of a copy of those steps

ddiff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
iindex aee9ce3..5eda0ef 100644
---- a/.github/workflows/ci.yml
++++ b/.github/workflows/ci.yml
@@@ -4,23 +4,14 @@ on:
      branches: [main]
    pull_request:
  jobs:
++  # install, node --check, npm test and openvibe-contracts-check: the shared test job (Track Q).
    test:
--    runs-on: ubuntu-latest
--    steps:
--      - uses: actions/checkout@v4
--      - uses: actions/setup-node@v4
--        with:
--          node-version: 22.22.1   # production runs Node 22
--          cache: npm
--      - run: npm ci --no-audit --no-fund
--      - run: npm test
--      - name: syntax check
--        run: for f in bin/ovhost lib/*.js lib/commands/*.js server/*.js server/*/*.js; do node --check "$f"; done && for f in scripts/*.sh; do bash -n "$f"; done
--      # Stage B's capabilities (host.site.manage, host.deploy.create, host.domain.manage) are
--      # proposals in docs/capabilities-proposal/ until the lead releases them in openvibe-contracts;
--      # until then the check reports them as undefined. Make this step blocking again with that release.
--      - name: contract check (openvibe-contracts)
--        run: npx openvibe-contracts-check --service host --src lib --src server
++    uses: OpenVibers/OpenVibe.Shared/.github/workflows/test.yml@e8b0caf086ad1f8fceaac80e2dca6cfe64f63602
++    with:
++      syntax-dirs: lib server
++      contracts-service: host
++      contracts-src: lib server
++      extra: node --check bin/ovhost && for f in scripts/*.sh; do bash -n "$f"; done
    # Secret scan (gitleaks) and dependency audit, shared by every OpenVibers repo (Track Q).
    security:
      uses: OpenVibers/OpenVibe.Shared/.github/workflows/security.yml@83c998b65424fb97e6f6de55ad9cc5981767e89c