feat: final smoke-test fixes + spectacular README + UI bugfixes

fix(api): wire slider_weights, filters, max_results and remove dead code

fix: resolve critical bugs - evaluation import cycle, bias detector, slider weights, and 7 more high-severity issues

Overhaul: Plackett-Luce ranking, PII anonymization, live fairness dashboard + LLM-free fallback agents

feat(extraction): add FieldExtractor pipeline, ProfileStore with lazy loading, and skill matching

feat: Phase 10 API layer — FastAPI with search/profiles/ingest/health endpoints

chore: create directory structure with __init__.py files and placeholder scripts