process_frame() is CPU-intensive (biquad filters, Welford stats,
BPM estimation, multi-person vitals) and can run for several ms.
At priority 5, edge_dsp starves IDLE1 (priority 0) on Core 1,
triggering the task watchdog every 5 seconds.
Fix: vTaskDelay(1) after every frame to let IDLE1 reset the
watchdog. At 20 Hz CSI rate this adds ~1 ms per frame —
negligible for vitals extraction.
Verified on real ESP32-S3 with live WiFi CSI: 0 watchdog
triggers in 60 seconds (was triggering every 5s before fix).
Co-Authored-By: claude-flow <ruv@ruv.net>
024d2583f0