dangernoodle-io / TaipanMiner / 24901177001

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fix(stratum): gate socket reads while mining is paused (TA-222) (#177)

observed on tdongle-s3: intermittent task_wdt reset mid-OTA when
esp_https_ota runs on core 0 at the same time the stratum task is
draining the tls socket on core 0. six consecutive failed attempts
before one succeeded on the same firmware.

mining_pause() only halted the hashing path, not the stratum session —
by design, to avoid reconnect churn during short ota checks. but under
load the two tls clients contended for core 0 and the ota's task wdt
fired.

while paused, sit on a 500ms sleep and skip the readline call. tcp
keepalive (60s idle) holds the session; pool messages queue in the
socket buffer and get processed on resume. no session drop, no
resubscribe.

preferred over bumping the ota task wdt timeout — addresses root cause
(core 0 contention) instead of papering over the symptom.

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