feat: in-text citations — visual styling, per-unit splitting, ADS search fallback

fix: final-review notes — true stage labels, sanitized network errors, dead line

feat: top-10 retrieval pool; plaintext/markdown manuscript input

test: make figures traversal test exercise actual traversal payloads

feat: figure extraction, caption retrieval, figures endpoint

feat: FastAPI endpoints — parse job SSE, annotate proxy with cache