refactor(ui): simplify pipeline progress display with st.progress bar

fix(logging): configure stdlib logging and structlog integration

feat(pipeline): switch to multi-variant search for broader trial recall

feat: add journey state guards and progress tracking

feat: add pipeline progress reporting and parallel evaluation

feat: enhance mock data with evidence pointers and MOCK-NCT IDs

feat: wire real API pipeline with demo mode and Gemini truncation fix

style: apply ruff format to entire codebase

fix: replace asyncio.run() with thread-safe sync bridge for Streamlit

feat: add Parlant bridge for Streamlit

fix: make advance_journey idempotent for same-state transitions

feat: implement 5 Streamlit pages, app.py entrypoint, and mock data

feat: implement 6 Streamlit components + FE services with 68 TDD tests