Fix remote candidate search returning 0 results by mapping preferred_work_mode

fix(core): add default values to MatchScores and slider_weights to SearchRequest

Refine skill matching and add original query pipeline

Multi-dimensional scoring upgrade: behavioral signals, career trajectory, skill proficiency, honeypot detection

fix: resolve 20 high/medium bugs across search, agents, core, and extraction modules

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(ui): wire search pipeline, add scoring sliders, fix infinite replan loop

feat(ingestion): add Phase 3 ingestion pipeline

feat(core): add Phase 1 core infrastructure