docs: index event-contract, rollout-guard, abuse-detection and storag… - #312

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Stale generated registry files detected in core/registry/. Run 'npm run registry' and commit the changes.

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/