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fix(bb_ota_pull): bounded retry on transport errors during OTA handshake (#71)

Wrap esp_https_ota_begin + esp_https_ota_get_img_desc in a 3-attempt loop
with 2s/4s backoff. Transient TLS failures (mbedtls fatal alert, ECONNRESET
during handshake, GitHub CDN redirect hiccups) are cleared by a short retry
instead of leaving the caller to re-trigger manually.

Retries only cover the pre-write phase; once esp_https_ota_perform starts
streaming into flash the existing single-attempt path still applies.

Improves the /api/ota/status error string to include the attempt count so
consumers (taipan-cli) can surface a clearer failure.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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