docs: add judging question answers with real traction data

feat(traction): add live HealthAI end-to-end analysis — real user, real product, real output

docs(presentation): update hackathon traction stats and opening line

feat: add HealthAI live demo session

docs: add presentation script

docs(master-plan): align with final codebase — add embedding dims, stubbornness rule rationale, retry pattern

docs(readme): remove references to unimplemented features

refactor: wire all modules to use shared utilities

docs(presentation): align pitch for judge and AI summaries with honest technical framing

docs: finalize traction with real user session data from demo outputs

docs: add 3-minute pitch script with real data

fix(api): ensure all endpoints degrade gracefully instead of crashing

feat(engine): add retry-with-reduced-context for failed debate rounds

docs(readme): align feature descriptions with implemented code

style: remove unused imports and commented-out code