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Closes S4 (AUDIT.md): Fanout.Run returned on the first sender error, permanently ending notifications for the process lifetime after one ntfy hiccup. Failed sends now go through an OnError hook and the loop continues. Also persists the delivery cursor to a file next to ORCHESTRA_DATA so a restart resumes from the last delivered event instead of re-notifying the entire log from seq 0. Adds the package's first test. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01W1rkJ2hBMybnJctPbcy4tT