feat: Sprint 9 — Execution & Quality Control

feat: SEC EDGAR ground truth + Kelly Criterion position sizing (Epic 3 & 4)

feat: LangGraph best-practices refactor (Sprint 8 Epics 2-3-4)

feat: major architecture refactor with yFinance screener, scoring, and insider feeds

feat: include WATCH verdicts in the paper portfolio tracker

feat: implement Graham-aligned Sector Logic gatekeeper and live Portfolio paper-tracking memory