feat(telemetry): first-run health — startup_ready, event_loop_stall, registration timing - #1294

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✅ Gathered PR context (6s)
✅ Completed bug detection (10m 35s)
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Final Result: Bugbot completed review - no new issues found! ✅

Request ID: serverGenReqId_fd93decb-10c2-4162-8a70-a9c9acbdebc2