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 49eba60..d2dcd55 100644
---- a/.github/workflows/ci.yml
++++ b/.github/workflows/ci.yml
@@@ -4,29 +4,12 @@ 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: sudo apt-get update && sudo apt-get install -y --no-install-recommends ffmpeg   # sound uploads are probed/converted
--      - run: npm ci --no-audit --no-fund
--      - run: npm test
--  contracts:
--    # Blocking once docs/capabilities-proposal/ is registered in openvibe-contracts and the chat
--    # service manifest lists them (docs/cutover.md, prerequisites). Until then it reports the gap.
--    runs-on: ubuntu-latest
--    steps:
--      - uses: actions/checkout@v4
--      - uses: actions/setup-node@v4
--        with:
--          node-version: 22.22.1
--          cache: npm
--      - run: npm ci --no-audit --no-fund
--      - run: npx openvibe-contracts-check --service chat --src server
++    uses: OpenVibers/OpenVibe.Shared/.github/workflows/test.yml@e8b0caf086ad1f8fceaac80e2dca6cfe64f63602
++    with:
++      apt-packages: ffmpeg   # sound uploads are probed and converted
++      contracts-service: chat
    # Secret scan (gitleaks) and dependency audit, shared by every OpenVibers repo (Track Q).
    security:
      uses: OpenVibers/OpenVibe.Shared/.github/workflows/security.yml@83c998b65424fb97e6f6de55ad9cc5981767e89c