feat: Add Paper Auto-Discovery (PAD) engine and update documentation

feat: Implement Podcast Persona Framework (PPF) - Revolutionary adaptive conversation system

feat: add configurable context limit for batch mode with validation

Clean up all marker-pdf references from documentation

Remove title generation feature entirely

feat: Add AI-generated podcast titles in Library

fix: Resolve UI bugs and add performance warnings

feat: Upgrade to Gradio 6 with MCP support

feat: Add CPU-based TTS support (Supertonic-66M)

before own tts system

update tts, llm engines

feat: Implement initial PaperCast application with core modules, documentation, a periodic curl script, and a Gradio certificate.