How two adversarial audit rounds of a TypeScript backtest engine surfaced 17 simulation bugs — from ghost positions to a Sharpe ratio inflated 2× — and what that teaches about testing any system whose output you trust.
How I built taskctx, a CLI that assembles deterministic context packs for AI coding sessions: GitHub issue, comments, PR states, and branch diffs across a multi-repo workspace, with delta-first rendering and full offline support.