NiusAudio 0.3.1

Apache-2.0 ecosystem release. Preserves the allocation-free audio module surface and ESP32-S3 ES8311 playback/capture implementation from 0.3.0 while adopting a standard permissive license for Arduino Library Manager distribution.

NiusAudio 0.3.0

First public NiusAudio release: ESP32 I2S playback/capture, ES8311 codec support, a broad module catalog, generic no-register I2S input/output drivers, strict Arduino lint, and reproducible AVR/ESP32-S3 builds.