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25baec48ee
Replace ProtoVarInt temporaries with direct uint32_t encoding functions to avoid unnecessary 64-bit widening on 32-bit architectures (ESP32 Xtensa). - Add encode_varint_to_buffer() free function for direct buffer encoding - Replace encode_varint_raw(ProtoVarInt) with uint32_t-native implementation - Add encode_varint_raw_64() for the few call sites needing 64-bit (BLE) - Remove unused ProtoVarInt::encode() and encode_to_buffer_unchecked() - Remove dead null checks from ProtoVarInt::parse() Net savings: -152 bytes flash on ESP32 IDF.
