feat: live PhoneLLM (pipecat-ai/phonellm-alpha-1) endpoint integration with full tool calling protocol

feat: load lightweight Kokoro-82M on-device neural TTS model via WebGPU/WASM with voice profiles

style: full comic book aesthetic with newsprint dot grid, chunky ink borders, speech bubbles, and zero purple

fix: add search_xkcd_by_topic tool for topics like Python (#353), Git (#1597), and SQL (#327)

style: soft pastel theme and enhanced neural on-device TTS engine with voice selection

feat: PhoneLLM + Pipecat XKCD Voice Agent with live tool calling

initial commit