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On creating a public event, Festipod submits it to the discovery index (an SDK call); the discovery screen reads the index instead of enumerating accounts. The app knows nothing of the index's owner, inbox, or materialization — it treats the lib as a finished SDK whose discovery is a global index. No store ids. Unit-validated in the lib (79 tests). @data broker validation deferred: the NextGraph broker (nextgraph.net/eu) was unreachable at run time — to be re-run in T03.d once the broker recovers. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>