feat: add privacy filtering and execution modes

fix: harden codebook and model fallback UX

feat: stream real pipeline progress to drive the analyze checklist

feat: serve designer React frontend via gradio.Server on ZeroGPU

feat: improve qwen zerogpu ux

feat: improve qwen zerogpu ux

feat: enable oauth-backed model assist

feat: add small model assisted analysis

feat: implement trace field notes mvp