feat: ZeroGPU backend for Hugging Face Spaces deployment (#4)

fix: launch pipeline via Hugging Face Jobs

feat: add scheduled job backend and resumable pipeline sync

fix: 8 critical bugs, config hardening, pipeline structural fixes, dead code cleanup (#3)

Update CLI execution info to display active LLM Backend

feat: Deploy on HF Spaces with Gradio Walkthrough interface

chore: full project audit — delete dead code, fix bugs, add 32 tests

feat: SmolLM2-135M ranker fine-tuning pipeline + BAML streaming improvements

feat: production-ready DenseFeed pipeline with jj workflow docs