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6b9e1045c0
Replace division-based line number formatting in LogBuffer::write_header with subtraction loops. The ESP8266 (Xtensa lx106) lacks a hardware divider, so each division compiles to an expensive software function call. Measured on real ESP8266 hardware (10000 iterations x 13 test values): - Division: 213,029 us - Subtraction: 118,503 us (1.8x faster) Flash savings: - ESP8266: -36 bytes (323 -> 287) - ESP32: -23 bytes (326 -> 303)
